Gotta go with the correct answer being A.
Vocal chords? since in theatre its mostly acting
On a 3.5 octave vibraphone, middle C (or C4) is the lowest C. On most marimbas, you will find C4 2 octaves below the highest C. Larger marimbas usually have a bigger range downwards from a 4.3 rather than upwards, most marimbas stop at C.
The painting is called Washington Crossing the Delaware, the artist who painted it was Emanuel Leutze. The event in the painting portrays General George Washington's crossing of the Delaware River on the night on December 25th, 1776 during the American Revolutionary War.