I The The answer is either b or d I hope it helps My friend Message Me if I’m wrong and I’ll change My answer and fix it for you
Answer:
Because if they mate with another carrier of the recessive trait, then the offspring is at risk of having the trait.
Explanation:
Endurance because he keeps moving at a pace he set for himself and even though he must be tired from all the stopping and running he still works hard and doesn't stop
