If a population of medium sized rodents is placed under a selective pressure that yields both very large and very small individuals it was most likely
a. a stabilizing selection
b. a disruptive selection
c. a directional selection
d. not a natural selection event

If a population of medium sized rodents is placed under a selective pressure that yields both very large and very small individuals it was most likely b. a disruptive selection. Disruptive selection is the type of selection that favors the extreme traits or phenotype rather than the average ones.