A pronoun is a word or gathering of words that represents to an individual or thing whereupon the activity of a verb is performed or toward which it is coordinated. Therefore to answer this question, the answer would be letter B, her: direct object. Her is pronoun of Christine.
The sentence would be: Did you tell Christine and her the good news. Based on this it can be said that it will be direct object. Since "her" is directly affected by the action of the verb. If the action was done for someone else then it would be indirect object.
The pronoun that best completes the sentence is 'Her', and it is used as an indirect object. In this context, 'her' refers to the person you are speaking to along with Christine. This indicates that both are involved in the action of being told the good news.
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