Can anyone please answer this question I cannot seem to get it

This means it has high amounts/alot of mass.

Explanation:

If things with mass attract each other, and things that attract strongly have a high gravity, then we can make the conclusion things with high mass have a high gravitational pull, and vice versa.

The question tells us Black Holes have great(high) gravity, so we can say Black holes also have high mass.

If this is confusing say so, and I'll try to elaborate.

c)red bank

explanation:

red bank is a borough in monmouth county, new jersey, incorporated in 1908 and located on the navesink river, the area's original transportation route to the ocean and other ports.

the answer for sodium is 0.186

the answer for rubidium is 0.251