The ages of the members of four teams are summarized below. Answer the questions about them. Team A: The range of ages is 14 and the mean age is 35.
Team B: The range of ages is 21 and the mean age is 33.
Team C: The range of ages is 16 and the mean age is 39.
Team D: The range of ages is 22 and the mean age is 31.
(a) Based on the information above, which team's ages have the least variability?

Team A

Team B

Team C

Team D
(b) Based on the information above, which team has the oldest members on average?

Team A

Team B

Team C

Team D