​Which Result Suggests That Someone in a Vegetative State Might

​Which result suggests that someone in a vegetative state might be conscious?

A) Some people in a vegetative state learned to blink their eyes to spell words.
B) ​The brain shows increased activity during times when body temperature increases.
C) ​An instruction to imagine doing something activated appropriate areas of the brain.
D) ​Some people in a vegetative state turn toward the voices of people they know.