Final answer:
The correct answer to complete the sentence 'Johnny never eats... fruit.' is 'any,' as it is used in negative sentences to indicate an indefinite amount or number.
Step-by-step explanation:
The correct answer to the question 'Johnny never eats... fruit.' is B. any. This sentence requires the use of the word 'any' to convey that Johnny does not eat any kind of fruit at all. In English grammar, 'any' is used in negative sentences, questions, and other statements of uncertainty to indicate an indefinite amount or number. The options 'some' and 'an' do not fit, as 'some' is typically used in affirmative clauses, and 'an' would refer to one singular item, which doesn't make sense with the negative verb 'never eats'.