The milky way is held together by a black hole's gravitational force. since the stars near this black hole move at a high speed, what can you
infer about the black hole?
a. its location
b. its size
c. its depth
d. its speed

B. Its size.

Explanation:

The black hole pulls the star as it passes across it.

This pull force of the black hole is due to its gravitational force, which depends on its size. It is assumed by scientists that the black hole is enormous.

The higher is the size of the black hole, the higher will be the gravitational pull  (as only then it can generate high pull force).

So, the correct answer is B. It's size.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.