18.

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

The main clause is grandpa worked in his garden every day, the parenthesis is planting and pruning, mixing and staking, weeding and mulching, and the subordinate clause is so I wondered why it looked so wild and overgrown. The punctuation before and after the inserted components is consistent, H/ Item J is wrong. Between the dashes are three parallel expressions, item F is wrong.