Answer: Part A: the correct answer is B. Tommy is an imaginative boy who yearns for adventure. He loves spending time with those sailors and imagines how it would be to become one of them.
Part B: the correct answer is G. And I would sit on the river-wall with my feet dangling over the water and sing with the men, pretending to myself that I too was a sailor.
Additional quotation: the correct answer is H. For I longed always to sail away with those brave ships when they turned their backs on Puddleby Church and went creeping down the river again.
In this two last excerpts, he describes the way he dreams about exploring the world on a ship and experiencing new things.