Which word does the underlined clause modify?

a biologist who studies marine animals is fascinated by this ecosystem.

a.
fascinated

b.
biologist

c.
ecosystem

d.
is

so what i read it

explanation:

the answer is d my man/woman the first passage is real the second is a setting.

the tone of the passage is sympathetic to the forbidden love of romeo and juliet. the nurse plays a significant role in the play. she is responsible for making their meeting again possible. additionally, there is a sense of warning in the choice of words of the nurse. she seems to be authoritative when she calls romeo "scurvy knave", and at the same time the fact that she addresses to him as "sir" reflects respect. the nurse is "vexed", this word describes her confused state of mind. on the one hand, she finds romeo a fine and eloquent man, but on the other, it is thought that man's nature forces men to try to trick women.