Answer:
A.
Step-by-step explanation:
The poem "Evening" is written by Victoria Mary Sackville-west.
The word "slumbrous" can be defined as a state of drowsiness or resting and relaxing.
The line "And slumbrous waters pool a slumbrous world; " (Quoted text) refers to the nighttime at ports. This line suggests that the ports during night are still, unmoving and at rest.
So, the correct answer is option A.