Answer:
B) "to picture one's self."
Step-by-step explanation:
In this excerpt, the word "envision" means "to picture one's self." We know this when we examine Nadia's practice routine. We know that she likes to follow several steps before she prepares herself to practice. One of these steps is to "envision" her hands moving along the keys. This means that Nadia tries to imagine herself playing, and she tries to think of the keys that her fingers will be touching.