In the 1890s, the biologist Hermon Bumpus found that sparrows that had survived a Rhode Island storm were more likely to be of intermediate size than sparrows that had perished from the storm. This is most likely an example of:

stabilizing selection

Explanation:

stabilizing selection - it is referred to as the type of natural selection that initially induce to push the population toward the median trait. it occurs on condition when the phenotype of either hand is unfavorable.

stabilizing selection is different from the directional selection as change occurs due to stabilizing selection is not drastic as directional selection and that is why is difficult to recognize.

i think it's a)sparta

both include an amendment process.