The answer would be B. Setting your on goals. Also if you could mark me brainiest if this helped you that would be great.
Answer:
How often you get get car service.
We have just clean windows.
I must get washing machine mend.
Let's have pizza deliver for dinner tonight.
Dad get fence repair last week.
Explanation:
There is approximately 100 billion galaxies known to be there..
The simple subject of this sentence is B. discovery.
Which is just an interrogative pronoun, it cannot be a subject. Important is an adjective, which cannot be a subject. You is an objective pronoun.