Answer
Option (b) is the correct answer that is given as the use of probiotics is an example of competitive exclusion.
Work Step by Step
The probiotics shows the competition with the harmful bacteria in the stomach for same resources. The two species competing for the same resources result in the exclusion of one, in this case, the exclusion of harmful species from the gut occurs.This way probiotics help to replenish the good and useful bacteria, which are lost from the body due to illness or after the use of antibiotics. Thus, option (b) is correct.
