"I wandered lonely as a cloud" is comparing a cloud directing to a persons feeling. This would be a simile.
Most likely subject not sure though
Answer:
The red panda is slightly larger than a domestic cat with a bear-like body and thick russet fur. The belly and limbs are black, and there are white markings on the side of the head and above its small eyes. Red pandas are very skillful and acrobatic animals that predominantly stay in trees.
Explanation:
Destroy is to build as arrival is to departure is the antonym analogy :D
I believe it is option "D.) The flu vaccine is not reliable enough to be worthwhile"
It would have a negative impact on the economy due to people not spending money to have the flu vaccine.