which sentence is in passive voice? an 1862 mexican military victory is commemorated by cinco de mayo. the…

Brief Explanations:

In passive - voice sentences, the subject receives the action. In "An 1862 Mexican military victory is commemorated by Cinco de Mayo", the subject "An 1862 Mexican military victory" is being acted upon (is commemorated). In "The holiday of Cinco de Mayo commemorates an 1862 Mexican military victory", the subject "The holiday of Cinco de Mayo" is performing the action (commemorates), which is active voice.

Answer:

An 1862 Mexican military victory is commemorated by Cinco de Mayo.