Each of the Following Groups of Things or Persons Has

Each of the following groups of things or persons has been divided according to a single basis of classification. However, one item in each group does not belong ⎯ it does not fit that single basis of classification. Read each group of items carefully; then select the letter of the one item that does not belong. Next, identify the single basis of classification that includes the rest of the group.
Part A: Vehicles
a. sedan
b. automatic transmission
c. convertible
d. truck
Part B: Basis of classification:
a. size of engine
b. body style
c. price