Answer:
A. Repeating this line emphasizes the intensity of the speaker's feelings.
Step-by-step explanation:
To solve this question, we need to look at the text of the sonnet:
How do I love thee? Let me count the ways.
I love thee to the depth and breadth and height
My soul can reach, when feeling out of sight
For the ends of being and ideal grace.
I love thee to the level of every day's
Most quiet need, by sun and candle-light.
I love thee freely, as men strive for right.
I love thee purely, as they turn from praise.
I love thee with the passion put to use
In my old griefs, and with my childhood's faith.
I love thee with a love I seemed to lose
With my lost saints. I love thee with the breath,
Smiles, tears, of all my life; and, if God choose,
I shall but love thee better after death.
If we didn't look at this sonnet, we would think that all answers make sense. That's why we need to have the text in front of us in order to discover the correct answer.
We can see that the speaker is telling about all the ways she loves her beloved. Her love is very deep, pure, free. It's filled with both happiness and sorrow (I love thee with the breath, Smiles, tears, of all my life). Based on this, we can conclude that, by repeating the words I love thee in this context, the speaker is emphasizing the intensity of her feelings for her beloved.