Anational survey interviewed 3800 people ages 18 and older nationwide by telephone. one question asked was the amount of gasoline they used in the previous week. of those sampled, the average response was 11.75 gallons.

reference: ref 13-1

a statistic in this situation is

select one:
a. the 3800 people interviewed.
b. 11.75 gallons.
c. the fact that those interviewed are age 18 and older.
d. all of the above