Answer :
The final couplet in an English sonnet functions primarily as D) the resolution of the problem presented in the quatrains.
A sonnet consists of 14 lines, there are three quatrains (=12 lines) and one couplet, which usually summarizes the poem and offers solutions to the problems.
A sonnet consists of 14 lines, there are three quatrains (=12 lines) and one couplet, which usually summarizes the poem and offers solutions to the problems.