Choice D is the best answer because it most accurately states the main idea of the text. The speaker describes the experience of being “weary” and “tired” and going to bed to seek “dear repose” (that is, sleep), but instead of sleeping, the speaker is kept awake (“keep my drooping eyelids open wide”) by thoughts of a friend (“my thoughts... [Begin] a zealous pilgrimage to thee”).
Choice A is incorrect because the text makes it clear that the speaker isn’t asleep; thoughts about the friend are keeping the speaker awake (“keep my drooping eyelids open wide”). Choice B is incorrect because the speaker isn’t talking about taking a literal trip when referring to “a zealous pilgrimage.” Rather, the speaker is referring to the experience of thinking about the friend, of taking “a journey in my head.” Choice C is incorrect because the text indicates that the speaker and the friend aren’t in the same place and having a conversation. Rather, the speaker is at home and thinking of the friend, who is somewhere else (“from far where I abide”)