In "A Defence of Poetry," Shelley suggests that emotions experienced in life are constantly changing. Which lines from "Mutability" can also be seen as a reflection of this idea?
O Streaking the darkness radiantly!—yet soon
Night closes round, and they are lost for ever
O We rest.-A dream has power to poison sleep,
We rise. -One wandering thought pollutes the day
We feel, conceive or reason, laugh or weep,
Embrace fond woe, or cast our cares away
O Man's yesterday may ne'er be like his morrow,
Nought may endure but Mutability

the answer should be a)directions.

the answer is fantasy

the correct answer is option d. none of these. it is noted that options a, b, and c share the same content.

despite the valid answer provided at the last sentence of each of the options, a question/answer format shouldn't include humourous themed responses such as "you bet your thermal pj's we do." - unless of course, the answer is carried out in an informal environment. this could be replaced with a simple "yes" or "it is necessary".

the question should be re-phrased to a more appropiate syntaxis. instead of "do we need the greenhouse effect? ", it should be written as "is the greenhouse effect necessary? " in order to give it a general scope, instead of limiting the answer to the needs of "we" the humans.