<h2>~<u>Answer</u> :-</h2>
- An attack by one country against another over a border dispute.

<u>Answer:</u>
(B) “Production and demand decreased with increased oil usage”
This was one of the factors for the decrease in demand for coal.
<u>Explanation:</u>
In 1930s, during the Great Depression period, the market saw a massive decline in the production of coal and a small steady increase in that of oil. One of the major reasons was the availability and price of oil and other natural fuels. The supply rate was higher than the demand rate which kept the prices of oil and other natural fuels low. Cost of mining and producing coal was very high. Lower prices and increased production of oil helped the producers to gain profit. This is one of the factors that helped oil to succeed ahead of coal.
The best option for why the US Congress passed an exclusion act in 1882 barring Chinese immigrants is because "<span>Chinese immigrants would work for low wages, which labor leaders felt took jobs away from US citizens", since workers were worried about competition. </span>
Austria had a deep seated hated for the Serbs partially due to their problems in the Balkans, and the assassination of Franz Ferdinand sealed the fate of WWI. William II initially gave Austria assurances of German support in the event of war and essentially told Austria to crush the Serbian problem before it got out of hand. When Austria declared war on Serbia after the assassination, it guaranteed both Russia (as Serbia’s protectorate) and Germany (as Austria’s ally) would join the war. Russia began to mobilize, which required Germany to move fast in order to execute the Schliefffen plan.