According to a longitudinal study on temperament, which followed participants into adulthood, which infant is most likely to change from infancy to age 4?

I believe the answer is: Michaela, who is inhibited and fearful

The characteristic of inhibited and fearful that displayed by small infants are most commonly caused by survival mechanism, which make the infant could only be comfortable in the environment that they're familiar with.

As they grow into 4 year olds group, their ability to perceive their surroundig would most likely be altered and the inhibted and fearful characteristic would start to diminish.