Yes it is, all can be just worded correctly. Hope this helps!
Answer:
D) A rule that is understood but not official.
Explanation:
To figure out the 3rd part of each question, look at the first few words or the first word.
1. WE moved because our house was too small
Is this a relative PRONOUN or a subordinating CONJUNCTION?
(Relative Pronoun).
If you are still stuck I will help you.