She gets up early to prepare breakfast so that her children can come to school on time.

• A. 
  Despite her getting up early to prepare breakfast, her children cannot come to school on time.
• B. 
  Because she wants her children to come to school on time, she gets up early to prepare breakfast.
• C. 
  If she does not get up early to prepare breakfast, her children will not come to school on time.
• D. 
  Unless she gets up early to prepare breakfast, her children will not come to school on time.