A metaphor is a speech device that compares one object to another object using words that associate them. In this case, the lines that use this literary device is A which compares hemisphere as the master of its own house.
The adverb clause here is <span>"since the sun came out" - it gives some information about the timing of the event.
It modifies "feels" (actually I would say that it modifies the phase "feels warmer") - this "feeling" happens since the sun came out, that's when it started!</span>
The answer is: A. Famous because it is the subject noun
slowly feeling my arms and legs swiftly swimming through the swimming lane
