Harley-Davidson Motorcycles has traditionally targeted men between the ages of 35 and 55. It has recently started to produce smaller bikes with less powerful engines in the hopes that women in the 25-to-45 age group might also be interested. What demographic variables did Harley-Davidson use to segment its market?

a. gender and age

b. lifestyle, gender, and age

c. gender, age, benefit, and family life cycle

d. benefit and age