Answer:
* Yo estaba esquiando en Colorado mientras tú visitabas a tu abuela en Nueva York.
Step-by-step explanation:
Because the sentence is being raised in the past tense, therefore we must conjugate the verbs taking this into account. Identifying the narrator, the genre, and the number. Thus we will be able to identify the correct verb in the parenthesis and that it is coherent with what is being expressed.