Answer:
A.
Step-by-step explanation:
A child's temperament can be defined as the way a child reacts to the people around her. the personality traits that are included in a temperament are emotionality, sociability, etc. As per the studies of scientists about 20-60 percent of temperament is genetically borrowed.
So, Willy and Bernice, a couple who are planning to have children will be more concerned about their temperaments because their children might possess their personality traits of being short-tempered.
So, the correct answer is option A.