Please help me Which statement is not true?

A) Dilations make images bigger.

B) Dilations make images smaller.

C) Dilations do not change the size of the pre-image.

D) A dilated image has different angle measurements than the pre-image.

E) A dilated image has the same angle measurements as the pre-image.

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?