Question

Which sentence has a verb in the active voice?
A. The electric telegraph was eventually replaced by wireless radio-wave transmission and the telephone.
B. Guglielmo Marconi perfected a type of radio technology.
C. In a wireless transmission, electromagnetic waves are sent over the airwaves by a system of transmitters.
D. In 1844, the telegraph was used to send the worlds first telegram.

Answer 1

The sentence that has a verb in the active voice is B. Guglielmo Marconi perfected a type of radio technology.
The rest of the sentences have their verbs in the passive voice. If you wanted to make a passive sentence out of B, you would say - A type of radio technology was perfected by Gugliermo Marconi. 

Answer 2

Answer:

B Guglielmo  Marconi perfected a type of radio tachnology.

Explanation: