Question

Even though Alexandra could talk with her friends during dance class, she couldn't sing along to the songs. Which best describes her heart rate during this
activity?
a) low
b) moderate
c) vigorous
d) dangerous

Answer 1

Even though Alexandra could talk with her friends during dance class, she couldn't sing along to the songs.the  best  that describes her heart rate during this will be moderate
because it its low vigorous or dangerous she cant talk or she may get unconscious
so correct option is B 
hope it helps

Answer 2

Answer:

Option C, Vigorous

Explanation:

Dancing is a vigorous form of exercise in which the breathing rate increases at a very fast pace.

Talking or singing while doing any vigorous exercise leads to further loss of energy and weak breathing pattern.

If Alexandra starts singing along with breathing, then she would not be able to perform dance efficiently for a long period of time.

Hence, option C is correct.