Answer:
The response is Option A: The child's heart rate accelerates.
Step-by-step explanation:
Children who have the temperamental style of being inhibited to the unfamiliar tend to show a lot of apprehension when they are put into unfamiliar circumstances. If the child is not used to being alone as was carried out in the experiment, then it is likely there will be some physical manifestation of her apprehension like an increased heart rate. An inhibited child will be shy and timid, with a tendency to be fearful of strange or unknown situations. Uninhibited children are bold and outgoing and they embrace social situations.