Select a suitable pronoun to complete the sentence: I don’t think she knows many people. When I see her, she is always by ________. 

Concept: If the object and the subject are the same thing or person, like in the above given statement than, we use a reflexive pronoun.

• In the above given statement the object and the subject is she.
• So we can use reflexive pronouns in this case. Reflexive pronoun used for the singular third person is herself, himself or itself.
• Here we can use herself because in the sentence a female noun is given.

Hence, option B is the correct answer.