El muchacho lleva a. una falda c. una blusa b. una chaqueta d. la caja

It is common to use the verb llevar when talking about clothes. Since we are talking about a boy in this sentence, we need to fill in the blank with a masculine item. The only masculine item given from the choices is una chaqueta that translates into a jacket. Finally:

El muchacho lleva una chaqueta

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the first is correct, the second is "la tienda de descuentos" meaning "the discount store", and the third is "ayer" meaning "yesterday".