The best answer would be D, because it interests all of you.
If not D, then it would be C, but D is the most reasonable answer :)
I am Hispanic, so I'm not, "Just Guessing"
El cree que puede correr más rápido
1: estamos
2: es
3:son
4:esta
5: soy
6:es
7:esta
8:viven
9:es
10:es
11:esta
12:es
13:estan
14:son
15:esta
16:es
17:es
18:es
19:som
20:esta
Answer:
1) usted is the more formal version.It's used when referring to someone who is older.Tu is informa