Answer:
A, "insubstantial"
Step-by-step explanation:
Based on Mercutio's description of dreams in lines 94b-101, the word that best represents his view of dreams is "insubstantial". In these lines, Mercutio says that dreams are "the children of an idle brain" and that they are "nothing but vain fantasy". He describes them as "airy" and "unsubstantial", suggesting that they are not real or meaningful. Therefore, option A, "insubstantial", is the best answer.