In Pamela, how does the epistolary style enhance the sentimental aspects of the novel ?

In Pamela, how does the epistolary style enhance the sentimental aspects of the novel ?

A. It provides access to the heroine’s innermost reactions.
B. It does not cloud the novel with authorial intrusion that confuses the emotions.
C. It provides a sense of immediacy because the letters are written in the thick of the action.
D. All of these answers