For genital arousal and orgasm to be possible during sex and foreplay, reflexes from the spinal cord conciliated by genital afferents from the pudendal nerve must be present. However, an injury to the spinal cord will most likely alter the neurophysiology of the genital organs of a woman and apparently lead to a disturbance in its proper functioning. Hence Leiko has had a problem with her spinal cord since the functioning of her genitals has been impaired.
The answer is B, because muscle endurance let's you do things like running for longer periods of time and muscular strength let's you do things like lift heavy weights.