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: Women
a. blonde
b. brunette
c. shiny
d. redhead
Part B: Basis of classification:
a. skin type
b. hair color
c. eye color