Context clues are defined as the cues or hints that surround an unfamiliar word and helps in determining the meaning of that word. These clues are provided primarily to assist the reader in determining the meaning of such words and understand the text coherently. In the given sentence, the context clues 'effects of proper diet and frequent exercise' suggests that the word 'restorative' means something that 'restores health.' Thus, <u>option A</u> is the correct answer.
