Select the answer with parallel structure. a. we searched for the lost keys in the yard, inside the toy box, and in my purse. b. we searched for the lost keys in the yard, and we looked in the toy box, and my purse. c. we searched for the lost keys in the yard, the toy box, and inside my purse. d. we searched for the lost keys in the yard, the toy box, and looked in my purse.

The sentence that uses parallel structure is option A) “We searched for the lost keys in the yard, inside the toy box, and in my purse.” since it uses the same grammar structure when listing things. In this case, the grammar pattern followed is a prepositional phrase that modifies the verb “searched”. The prepositional phrases are “in the yard”, “inside the toy box” and “in my purse” since all of them start with a preposition.

In the rest of the sentences there is a break in the pattern when listing the items so no parallelism is possible. In option D) for example, there is a mix of grammar structures since it starts with prepositional phrase “in the yard”, followed by a  noun phrase “the toy box”, and finishes with verb phrase “looked in my purse”.  

caminas makes the most sense here since it means to walk.