In which of the following scenarios would a firm's profit margin on sales increase?

• A
• :
• The firm's net income increases while its average total assets decrease.
• B
• :
• The firm's net income increases while its net sales decrease.
• C
• :
• The firm's net income decreases while its average total assets remain constant.
• D
• :
• The firm's net income decreases while its net sales remain constant.