Question

Golden retrievers are friendly family pets. ___________________ known for having good temperaments with young children.

Answer 1

First off you have to know ur meanings for there ... and we can automaticly rule out  D cuz thats not a thing

Their is Possessive example... Its their bag

There is telling a location Example: There was a horse in the pasture

They're is a contraction of the word They and the word Are an example would be They're going to the store

The answer in that cause would be C. They're

Answer 2

The answer is C. They're