The correct answer to this open question is the following.
Although there are no options attached we can say the following.
The meaning of the above sentence is that no matter how difficult the conditions are, no matter the unpleasant of the actual situation, or the size of the problem, there is always an answer if you are brave, smart, perseverant, and committed to doing the things that you need to do in order to strive and find a solution.
For that to happen you have to have faith, be patient, but always work hard no matter what. Your determination has to be stronger than any problem. That is how at the end, there is a "light at the end of the tunnel" and things start to move again, and you find solutions to everything.
It was stock market "speculation" that contributed the most to the Depression of 1920-21, since the value of many companies became incredibly inflated.
"From the mid-1970s there were new claims for the independent invention of iron smelting on central Niger and from 1994–1999 UNESCO funded an initiative "Les Routes du Fer en Afrique/The Iron Routes in Africa" to investigate the origins and spread of iron metallurgy in Africa. This funded both the conference on the early iron in Africa and the Mediterranean and a volume, published by UNESCO, that has generated much controversy because it included only authors sympathetic to the view that iron was independently invented in Africa. Two major reviews of the evidence were published in the mid-2000s. Both authors concluded that there were major technical flaws in each of the studies claiming the independent invention. Three major issues were identified. The first was whether the material dated by radiocarbon was insecure archaeological association with iron-working residues. (Many of the dates from Niger, for example, were on organic matter in potsherds that were lying on the ground surface together with iron objects). The second issue is the possible effect of "old carbon" - wood or charcoal much older than the time at which iron was smelted. This is a particular problem in Niger, where the charred stumps of ancient trees are a potential source of charcoal and have sometimes been misidentified as smelting furnaces. A third issue is the inherent lack of precision of the radiocarbon method itself in the range from 800 to 400 BC, which is attributable to the irregular production of radiocarbon in the upper atmosphere. Unfortunately, most radiocarbon dates for the initial spread of iron metallurgy in sub-Saharan Africa fall within this range."
Gorilla warfare was one of the tactics. The colonist knew the areas better then the British soldiers did so it was easy to hide in tree lines and attack the unsuspecting soldiers.
