Which of the following statements is not correct?

a. workers change jobs less frequently today
b. the size of the labor pool is decreasing
c. the u.s. population is getting older
d. the u.s. population is becoming more diverse

I feel like I am over thinking this question.

the size of the labor pool is decreasing

i accept fg tips

diverse is a loaded term since it's not defined explicitly (racially? ethnically? age? skill set?), so i would ignore that one.

this one is my gut feeling:
b. the size of the labor pool is decreasing

i'm guessing as population is increasing, so the number of people in the labor pool is likely increasing. but i didnt look up the numbers.