Final answer:
The correct commands to make Tracy turn to face vertically upward in the coordinate system from facing right are left(90) and right(-90), which corresponds to turning 90 degrees to the left or effectively the same movement in a negative right direction.
Step-by-step explanation:
The question pertains to a scenario where Tracy is initially facing to the right side of the coordinate system and needs to turn to face vertically upward in the coordinate system. Option A, which is left(90), and Option C, which is right(-90), are both valid commands for turning Tracy to face up. Option A would turn her 90 degrees to the left, and Option C would turn her 90 degrees in the negative right direction, which is effectively the same as turning left. These two options result in Tracy facing upward. Option B, turn(up), is not a conventional direction command in most programming environments. Option D, setposition(90), does not relate to rotation; instead, it suggests setting a specific position, not a direction of facing.
Hence, the correct answer would be 'A and C', as both these options accomplish the goal of making Tracy face upward.