Metabolic fitness can be achieved through
a. a moderate-intensity exercise program.
b. a high-intensity speed-training program.
c. an increased basal metabolic rate.
d. anaerobic training.
e. an increase in lean body mass

b. a high-intensity speed-training program.

Explanation:

a, b, c - sides of a triangle

a + b > c

a + c > b

b + c > a

we have a = 5m and b = 11m. substitute:

5 + 11 > c

16 > c → c < 16

5 + c > 11         subtract 5 from both sides

c > 6

11 + c > 5         subtract 11 from both sides

c > -6

c < 16 and c > 6 and c > -6

thereofre your answer is 6m < c < 16m