The correct option is this: CAMEL CARAVANS CARRIED GOLD AND OTHER RESOURCES FROM SUB SAHARAN AFRICA NORTH TO SEAPORT AND ALL THROUGHOUT AFRICA.
Camels, because of their abilities to survive the harshness of deserts were used as the animal of choice by merchants to transport gold and other resources from one point to another in Africa in order to sell these goods. Traders traveled and distribute their goods using camel caravans.<span />
A) How to resist peer pressure and avoid harmful drugs
I know its not mosaics, that was after their time, collages are way after their time. And impressionism is a 19th century art. so I believe the answer is D weaving
To my knowledge, the correct answer among all of the given choices is C.) Steam. If I'm not mistaken, this was the time that more trains came into use.
I hope this is the answer you were looking for and that it helps!! :)