The correct option is D Implied subject 'you'
Option D is the correct answer. The sentence begins with the verb read, indicating a command directed at someone, presumably the implied subject, the pronoun you. Option A is a verb and cannot be a subject. Option B includes the verb with the phrase the works which is the object of the preposition of. Option C contains part of the matter said to someone, here, the subject. Thus, it is part of the predicate. Therefore, Options A,B and C are all incorrect.