At a particular college, $78 \%$ of all students are receiving some kind of financial aid. The school newspaper selects a random sample of 100 students and $72 \%$ of the respondents say they are receiving some sort of financial aid. Which of the following is true?
(a) $78 \%$ is a population and $72 \%$ is a sample.
(b) $72 \%$ is a population and $78 \%$ is a sample.
(c) $78 \%$ is a parameter and $72 \%$ is a statistic.
(d) $72 \%$ is a parameter and $78 \%$ is a statistic.
(e) $78 \%$ is a parameter and 100 is a statistic.