Under the contribution income statement, a company's contribution margin will be: a. higher if fixed sg& a costs decrease. b. higher if variable sg& a costs increase. c. lower if fixed manufacturing overhead costs decrease. d. lower if variable manufacturing overhead costs increase.

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.