Answer:
D. Heart
Step-by-step explanation:
In "I Look Into My Glass" the poet, Hardy contrasts an ols man's decaying body with a younf man's potential to love with imagery related to heart. As the speaker sees itself in the mirror he observes that he has wrinkled and ageing skin, he wished his heart was similarly reduced and weakened. However, speaker says that his romantic feelings are still similar to that of a young man and has those similar feeling of longing, love and infatuations.