Thoreau believes that... А
humans should devote their lives to putting out fires and helping each
other.
B
humans spend too much time sleeping.
humans should be much more productive in their waking hours.
D
humans spend too much time preoccupied by other people's problems.

D humans spend too much time preoccupied by other people's problems.

Explanation:

Henry David Thoreau was a poet, novelist, and philosopher who is known for his works "Walden" and "Civil Disobedience" where he talked about simple living and making an argument for being disobedient to an unfair state, respectively.

He believed that humans spend too much time preoccupied by other people's problems.

c hydrophobia is the answer