To read what is said means to

thick as the foliage of the waving wood; the figurative language that is used here is referring to a battle. there are two mountains that are facing opposite of each other, and they have armies better stick like a forest.

the answer should be d) he was one of those young thousands who greeted the war with a certain amount of relief, welcoming the liberation from webs of tangled emotion" since it is the best option because it shows his desire to free himself. 

hope this answer you! have a great day.