Topic: Right Form of Verb,

Best Answer Explained in Below-:

The question "Babies — when they are hungry." is looking for the appropriate verb form that correctly fits the context of the sentence. In this case, the correct answer is A) cry. This selection is appropriate because "cry" is the base form of the verb, which is used to express a general action or state.

When describing what babies do generally, the base form "cry" effectively communicates that it is a regular behavior that occurs when they are hungry. It encapsulates the habitual action of babies crying as a need for attention, specifically for food.

The other options, while related, are not as fitting in this context:
- B) "cries" is singular present tense and suggests a single baby, which can be too limiting.
- C) "cried" is the past tense, indicating an action that has already happened, rather than a current or general state.
- D) "are crying" suggests an ongoing action happening at this moment, which again does not capture the overall behavior.

Thus, "cry" correctly reflects the general and timeless nature of how babies express hunger.