Which sentence is in the active voice

the pact was negotiated by a team of seasoned diplomats.
the garden was colonized by a dazzling variety of weeds.
our teacher was quoted in a magazine last week.
our old toaster always burns the toast on one side.

The answer is D: Our old toaster always burns the toast on one side. This sentence is using an active verb. The other sentences are in the passive voice, which is formed by putting the verb to be into the same tense as the active verb and adding the past participle of the active verb. (A) to be: was + negotiated;  (B)to be: was+ colonized; (C) to be: was + quoted.  In the active voice, they would be:  (A) "A team...negotiated the pact."; (B) "A dazzling...colonized the garden." and (C) "A magazine quoted our teacher..."

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