Let's solve the inequality:
r/2 + 5 ≤ 8
Subtract 5 from both sides:
r/2 ≤ 3
Multiply both sides by 2 to get rid of the fraction:
r ≤ 6
Now we can check which values satisfy this inequality:
A) r = 9: 9 is greater than 6, so it does not satisfy the inequality.
B) r = 12: 12 is greater than 6, so it does not satisfy the inequality.
C) r = 15: 15 is greater than 6, so it does not satisfy the inequality.
None of the given values A, B, or C satisfy the inequality r/2 + 5 ≤ 8.