In a Social Work Class, There Is a Perfect Positive

Multiple Choice

In a social work class, there is a perfect positive correlation (1.0) between height and weight. All 25 students are asked to line up by height, shortest to tallest. What will happen if they are then asked to line up by weight, lightest to heaviest?

A) About half of the students will move; others will stay in place.
B) Only the 13th student will stay in place; everyone else will move to the same position but in the opposite end of the line.
C) Everyone will have to move, but in no discernible pattern.
D) No one will have to move.