Question

Which sentence from the passage uses active voice?

A) This secret language has been studied by scientists for some time.
B) The meaning of their chatter was unable to be decoded by scientists.
C) In fact, scientists believe that every bottlenose dolphin develops a unique whistle.
D) A number of definitive movements bottlenose dolphins make have been identified by researchers.

Answer 1

C is the correct answer

Answer 2

C. Active voice is the opposite of passive voice, which is easy to remember. If it has "by" someone, its passive, otherwise it's usually active.