For this case what we should do is fill in the blank with the correct verb.
The verb to use is:
"ser"
The conjugation of the verb is for the second person singular.
The conjugation time of the verb is simple present.
Therefore, the sentence in Spanish is:
Tú eres alto.
The translation of this sentence in English is:
You are tall
Answer:
c. eres
Tú eres alto