I believe that the answer is A 137-186,
that is the answer if you use the Karvonen formula
Karvonen formula : target training HR = resting HR + (0.6 [maximum HR -resting HR]).
1. Resting Heart Rate (RHR) = your pulse at rest
2. Maximum Heart Rate (MHR) = 220- your age
3. Heart Rate Reserve (HRR)= Maximum Heart Rate - Resting Heart Rate
sorry idk why my answer was deleted
