The correct response to the question: ¿A quién se lo das? Is:
c. Se lo doy a Marta.
Explanation:
You can see the structure form of the question: ¡A quién <u>se</u> <u>lo</u> das? Te underlined words are object pronouns that must be used in the answer, in the case of the verb, <em>the question refers to you</em>, by that reason <em>the answer must be with the personal pronoun I</em> or in <em>Spanish</em> "yo" and the correct conjugated form of the verb "dar" for that noun is "doy".
