Answer:
Correct option is (D)
Step-by-step explanation:
Contribution is computed as total sales less variable expenses. Contribution margin will increase if sales generated is more than variable expenses and vice-versa.
Fixed expenses are not considered in calculation of contribution. Option A and C are incorrect as fixed expenses are not considered.
Option B is incorrect as contribution margin will not be lower if variable selling, general and administrative (S,G &A) expenses increase.
Therefore, contribution margin will be lower is manufacturing overhead costs increase.