He _____ hungry. He isn’t eating his food ?

In the sentence "He _____ hungry. He isn’t eating his food," the correct option is D) "must not be." This choice fits the context and conveys a logical inference about the person’s state.

The phrase “must not be” indicates a strong conclusion based on the evidence presentedthat the individual is not eating. If someone is hungry, it's typical for them to eat when food is available. Thus, the lack of eating suggests that he is likely not experiencing hunger.

In contrast, let's analyze the other options:

A) "should be" implies an obligation or expectation, which does not align because it contradicts the observation that he isn't eating.

B) "needn’t have been" refers to a past situation that is no longer relevant or necessary, which does not apply to the current context.

C) "might not have been" implies uncertainty about a past situation, which doesn’t provide clarity regarding the present state of hunger.

Thus, "must not be" is the strongest choice as it directly reflects the logical deduction from the current behaviorhe is likely not hungry, given that he is not eating.