Marla is an architect who is designing a home for Charles. Charles is paying Marla $150 per hour to design his new home. When Charles and Marla get married, Marla continues to work on designing the home, but she no longer charges Charles for her work. As a result, GDP because Select one: A. falls; Marla's work becomes less valuable once she's married B. falls; Marla's architectural design services are no longer bought by Charles once they're married C. rises; Marla becomes more productive once she's married D. falls; Marla's work takes place in the underground economy once she's married