Answer:
Option D, increases in certain measures of spatial ability
Step-by-step explanation:
Testosterone is associated with spatial and mental rotation ability in male and female respectively. If a male has high testosterone level, then his spatial abilities lower down while in case of women , high testosterone level leads to higher mental rotation abilities (which are noting but the spatial abilities).
For a transsexual female, the effects of increase in testosterone will be similar to the effect of increase in testosterone in females.
Thus, a transsexual females taking testosterone will show better spatial abilities and hence option D is correct.