The steel drum is believed to be the only non-electronic, acoustic musical instrument invented in the 20th century.
An outline is being defined as a 2 dimensional shape which is the answer. The outline also known as the list being arrange to portray the hierarchical relationship and known as a tree structure. It is used in order to portray the main points or a topic in a subject.
Are you wanting to know the pitch below F#? if so that would be F.
The answers to this question are A, B, and D. hope this helps :)
