Answer:
Academic learning time.
Explanation:
The Academin learning time, refered to as ALT, is the amount of time in which students are active, successfull, and productively enganed in learning.
In this case, Alice is boosting the ALT of her students by structuring her instructions and giving them the choice of working alone or with her. Those students who struggle can be helped by her and those who don't can work on their own or however they feel most comfortable.
(B. ) Square Miles or Kilometers in the Region
To calculate the population density of an area you would divide the number of people by land area in either square miles or kilometers.