Can someone check my answers for this

Translate the sentence below into english.    pienso que nunca lo sabré. a. she doesn't believe he will ever find out. b. i believe that i'd never find out. c. she thinks that i'll never find out. d. i think that i'll never find out.

My spanish teacher said this to me.. look at the ending on your verb. you need to make it agree with "yo" this is my sentence- sí yo estudiar español en la escuela how do i make it agree with "yo"

14. choose the answer that best completes the sentence. (practicar) fútbol. (2 points) a: practica b: practicamos c: practico d: practicáis