Mountainburg industries has developed two new products but has only enough plant capacity to introduce one product during the current year.
the following data will assist management in deciding which product should be selected. mountainburg's fixed overhead includes rent and utilities, equipment depreciation, and supervisory salaries.

selling and administrative expenses are not allocated to individual products. =direct materials -product l=$44, product w=$36.
machining labor ($12/hour -product l=$18, product w=15.
assembly labor ($10/hour) -product l=$30, product w= 10.
variable overhead ($8/hour) -product l=$36, product w=18.
fixed overhead ($4/hour) - product l=$18, product w=9.
total manufacturing cost -product l=$146, product w=$88.
estimated selling price per unit -product l=$170, product w= $100.
actual research and development costs-product l=$240,000, product w=$175,000.
estimated advertising costs - product l=$500,000, product w=$350,000.

the advertising costs for the product selected by mountainburg will be:

a) conversion costs.
b) opportunity costs.
c) prime costs.
d) period costs.