Which word correctly completes this sentence? el hermano de mi madre es mi _

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"

Ineed some one to translate this for my home work !

7. choose the answer that best completes the sentence. (estudiar) para el examen. (2 points) a: estudias b: estudia c: estudiamos d: estudio