The correct pronoun to use is whom. (Option B). Hence the correct sentence will read:
"To whom am I speaking?"
What is a pronoun?
A pronoun is any of a select group of terms in a language (such as I, she, he, you, it, us, or they) that are used as replacements for nouns or noun phrases and whose referents are identified or understood in context.
Why are pronouns important?
Pronouns play an important role in how we interact with one another.
The value of pronoun communication, on the other hand, cannot be overstated.
We use pronouns to identify or refer to people or things.
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