Erica Andreeva is a professional tennis player too. C mother's name is Raisa Andreeva.

Step 1: Analyze the sentence. The sentence states that Erica's mother's name is Raisa Andreeva.

Step 2: Consider the options. The options are WIN, OLD, THEY, BE, BEGIN.

Step 3: Choose the correct pronoun. 'Her' refers to Erica, indicating possession of the mother.