1. I believe the correct answer is D. He is at least able to feel comforted thanks to the love of another. The speaker talks about the turmoil and anxiety he feels while trying to escape "the world's prying eye". He is trying to run away from people and all humanity, being disappointed or ashamed. The last three lines express some kind of solace that he has found, thanks to love. But this love doesn't necessarily have to be a romantic love. It can also be God's love.
2. I believe the correct answer is A. old and close to death. He unequivocally talks about the passing of time and imminent death. His lover has to reconcile with this fact. This is not a statement that seeks comfort, but a grim reconciliation with the fact that death is near. The speaker bids his lover to love him even more now that it is clear that he won't live much longer.
3. I believe the correct answer is C. spiritual terms. This sonnet doesn't describe love in a physical or even romantic way. We don't even get to learn anything about her beloved. It depicts love in a spiritual way, with the use of adjectives "freely", "purely". The speaker loves her lover in thousands of ways, and she hopes her love will spread beyond the grave, and even grow stronger.