Anvil is a tool used by blacksmiths, and it is the surface on which the object is placed which is worked on with a hammer- stroked with a hammer.
von Bülow meant (in 1899) that Germany will either have to colonize others ( be the hammer) or it would have to risk being colonized itself (being the anvil), hence showing the need for Germany to participate in colonization.
I believe the Zimmerman Telegram. America received a coded message from Mexico, which wasn't so nice.
I am not sure on what the right answer is but I would choese C or D.
B is the answer (La Misión de Corpus Christi de San Antonio de la Ysleta del Sur)
Fragile; To be in a state where something can be easily broken.