Answer:
B. A reference where information is found
Pre- means before, e.g preschool means before school. So a prelude comes before it, or precedes it
Understand what is gained by treating a topic two different ways.
Gotcha pal
The disposal of old obsolete machinery
They discourage investment and impoverish their people
The music was so dull
I saw a fish flop on the floor
The disease affected a span of 100 people