The correct answer is: B. smaller.
Interspecific competition is a type of competition that occurs between two or more species that share a similar niche. This can lead to a decrease in the size of the niche for each species, as they are forced to compete for resources. This can also lead to changes in the way that the species interact with each other, as they try to avoid competition.
Option A is incorrect because interspecific competition can lead to a decrease in the size of the niche, not an increase.
Option C is incorrect because interspecific competition does not necessarily lead to a change in the shape of the niche.
Option D is incorrect because interspecific competition does not necessarily lead to a change in the location of the niche.