Question

Choose the sentence that is grammatically correct.

Answer 1

The correct answer is:  [C]:  "A ellos les gusta comer enchiladas." 
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The "les" is the indirect object pronoun that is modified by  "a ellos".

The Spanish verb "gustarse" functions as a  "reflexive verb".
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Answer 2

C. A ellos les gusta comer enchiladas
To find the answer for these types of questions it helps to say the options out loud and the one that makes more sense is the right answer