While at the Dentist, Six-Year-Old Alex Listened as His Mom

While at the dentist, six-year-old Alex listened as his mom told the dentist she flosses her teeth at least three times a week. Alex noticed that the dentist smiled at and complimented his mom on her behavior. As a result of this brief encounter, Alex's mom will be likely to continue to floss as a result of _____, and Alex will be likely to have a favorable attitude concerning flossing as a result of _____.

A) observational learning; operant conditioning
B) operant conditioning; observational learning
C) operant conditioning; classical conditioning
D) classical conditioning; operant conditioning