The cow would be consuming 80 gallons of water during a hot day. If on any day the cow drinks 40 gallons on a hot day it drinks double the amount so you multiply them by 2 and its 80. I hope this answer can help you.
Twilight is the metaphor for aginf tha Shakespeare uses. Option C is correct.
A metaphor is understood as a figure of speech that describes an object or action in a way that isn’t literally true, but helps convey an idea or draw a comparison.
A metaphor states that one thing is another thing.
Metaphors are used in poetry, literature.
So, this literary decive is implemented in order to encourage the reader to make a comparison between two seemingly unrelated things.