Which is a fact?

rescue groups around the country place greyhounds in loving homes.

labradors bark more than greyhounds, so you don’t want one in your backyard.

greyhounds make better pets than labradors because they run faster.

labradors snore loudly at night and will keep you awake long after bedtime.

The answer is:  [A]:  "Rescue groups around the country place greyhounds in loving homes."

Consider the other answer choices:

[B]: "Labradors bark more than greyhounds, so you don’t want one in your backyard."   This is not a "fact, how does one "KNOW" if one doesn't want one in one's backyard?  Even if it IS TRUE that labradors bark more than greyhounds, someone still might prefer to have a greyhound, even in one's backyard, for many reasons (e.g. one has reasons for preferring a greyhound; and one doesn't mind the "barking in the backyard" if one has a large home with a large background that is isolated from neighbors.

[C]:  "Greyhounds make better pets than Labradors because they run faster."

Keywords: "better" and "because" —subjective and prone to interpretation.

[D]: "Labradors snore loudly at night and will keep you awake long after bedtime."
 → is NOT a "fact".  How does one know that labradors would keep one awake "long after bedtime"?  When, exactly, is one's "bedtime"?  "Where", exactly, does the labrador have to be during one's "bedtime"?  And will the loud snoring of a labrador at night (even if true) necessarily "keep you awake long after bedtime"? (You could be a very sound sleeper).

The answer to your question is option a