Explain the function of verbals (gerunds, participles, infinitives) in general and their function in particular sentences.

Explanation:

about gerund don't confuse your mind

it's just verb +ing

running

walking

talking

eating

reading

answer; /// the correct answer to the above statement is (a) because of the decline on native american labor forces;

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.