Answer:
I learned this not too long ago too!
I think the answer you are looking for is parallax. Hipparchus used parallax to not only measure the distance from the sun, but also the moon. Although he was off my a couple hundred yards or so he actually measured the moon before the sun.
<span>Western powers began to expand their influence in the Middle East in the 1920's due to</span> the Middle East became vulnerable to conflicts because of its internal difficulties.
<span>1. Archduke Franz Ferdinand is assassinated in Sarajevo.
2. </span><span>Russia mobilizes its vast army to intervene against Austria-Hungary in favor of its ally, Serbia. This move starts a chain reaction that leads to the mobilization of the rest of the European Great Powers, and inevitably to the outbreak of hostilities.
3. </span><span>Germany invades Belgium, beginning World War I.
4. </span><span>A German submarine sinks the passenger liner </span>Lusitania<span>. The ship carries 1,198 people, 128 of them Americans.
5. </span><span>The British employ the first tanks ever used in battle, at Delville Wood. Although they are useful at breaking through barbed wire and clearing a path for the infantry, tanks are still primitive and they fail to be the decisive weapon, as their designers thought they would be.
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I would say B for this question. Hope it helps
