Rifles, shotguns, and handguns differ mostly based on their: a. barrels and b. ammunition

Option:  a. barrels

Explanation:

Different types of guns are distinguish through the size of their barrels. A barrel is a long metal tube with hollow inside that allows bullets to pass when fired. Usually, large barrels allows bullets to hit the target more often without missing it. The shotguns use for hunting animals and often use to shoot small and fast-moving targets. Handguns also are known as pistols, which are smaller in size compared to the others.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

are there actual statements because if not my answer would be: that using the five senses the author can create a sense of worth in an object to appeal to the reader and create meaning.