Fill in the blank with the most appropriate adverb from the given options :

He ________ talks ill of his friends.

(A) where
(B) immediately
(C) never
(D) slowly
(E) soon

Choose the correct answer from the options given below :

(C) only

The correct adverb to fill in the blank is "never." Therefore, the correct answer is (C) only.

Explanation: "He never talks ill of his friends."

This sentence implies that the person in question does not engage in speaking negatively about his friends. The adverb "never" expresses the absence of this behavior. The other options, such as "where," "immediately," "slowly," and "soon," do not fit the context of the sentence, as they do not convey the intended meaning related to speaking negatively about friends.