Answer:
A. As a child in the 1930s, MacCready liked to do many different things.
Step-by-step explanation:
According to the passage "Paul MacCready", it is narrated that as a child Paul liked to do different things and among his passions was things that bad to do with flying. He studied butterflies and moths and noticed how they spread their wings to fly with minimum effort.
He later enrolled for a science fair and made a prototype of a flying plane which won him the first prize.