A. He believes the landlords take advantages of their tenants.
Explanation: I got it right on Apex : (heart)
As it is discussed in the question, this given line is additional which is not included in the poem. Since it is a multiple choice question, we have to work through the answers. It is easy to observe that first and third options does not follow the regular rhyme of the poem since the stanza contains rhyme. We choose second option over the last one because the second one obeys the rule of prosody, as well. So that, the correct answer is the 2nd one.