I'm pretty sure it is prevent injury. Stretching doesn't usually build strength or endurance.
Type II error is called false negative, that mean that you say the null hypothesis is right when it is not. In this case, the null hypothesis is "the drug is not safe". Then the error should be <span>to conclude the drug is safe when in, fact, it is unsafe</span>.
"Glaucoma" is a <span>condition of late adulthood in which the pressure in the eye increases.
So, option D is your answer.
Hope this helps!</span>