1 George Washington Gale Ferris began his career in the railroad industry and then pursued an interest in bridge building.

2 Ferris realized that there was a growing need for structural steel in America.

3 G.W.G. Ferris & Co. was founded to test and inspect metals for railroads and bridge builders.

4 Only later did Ferris gain fame as the inventor of the famous wheel.

If Sara wants to maintain active voice in her text above, which sentence needs to be revised?

A. 1
B. 2
C. 3
D. 4