Which ethnic group in the united states is burdened with the greatest rates of hiv infection according to 2015 reports?

Ithink it would be a and b

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)