The Student Newspaper at a College Asks a Simple Random

The student newspaper at a college asks a simple random sample of 250 undergraduates, "Do you favor eliminating supplemental fees for lab courses?" In all, 150 of the 250 are in favor of eliminating such fees.
To estimate p, you will use the proportion = 150/250 of your sample who favored eliminating supplemental fees for lab courses. The number is a

A) bias.
B) confidence level.
C) mean.
D) parameter.
E) statistic.