Great britain's stated reason for declaring war on germany in 1914 was the

select one:
a. french attacks on german colonies.
b. u.s. entry into the war.
c. german invasion of belgium.
d. serbian assassination of archduke franz ferdinand.

C.) German invasion of Belgium.

Belgium was neutral during WWI.  Britain was scared that if Germany ruled Belgium, they would be a threat to their country.  Once Germany attacked France by going through Belgium, Britain couldn't ignore Germany's actions anymore.  Britain decalred war on Germany because of their actions.

Hope this helps.

Explanation:

The Columbian Exchange is extremely important on many levels. The primary sphere of relevance is that it marked one of the first moments where there was a pure exchange of ideas, livestock, food, and goods between the world of "the West" and the "New World."