Question

what result are you expecting to see in the negative control?
a) the cells die
b) the cells are not stained
c) the majority of cells turn red
d) all cells turn red

Explanation:

A negative control is designed to show no positive result for the test (here, staining). It excludes the factor that causes the positive outcome, so no staining should occur.

Answer:

b) The cells are not stained