Select the option that expresses the given sentence in active voice.

The sweet mangoes were eaten by the children.

The children ate the sweet mangoes.

The correct option that expresses the given sentence in active voice is The children ate the sweet mangoes.

The other options are incorrect because:

• The sweet mangoes were eaten by the children is in the passive voice.
• The children were eating the sweet mangoes is in the present progressive tense, while the original sentence is in the simple past tense.
• The children was eating the sweet mangoes is grammatically incorrect. The verb "to eat" is transitive, which means that it takes a direct object. However, the subject of the sentence is "the children," which is not a direct object.
• The children are eating the sweet mangoes is in the present tense, while the original sentence is in the simple past tense.