Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
The early periods of aviation in the United States was marked by exhibition flights made by individual fliers or by teams of performers at county fairs.
A. periods of aviation
B. exhibition flights
C. individual fliers
D. teams of performers
Answer the question before viewing the answer below
Correct answer: A