Which Scenario Exemplifies the Concept of Efficiency Versus Effectiveness in Time

Which scenario exemplifies the concept of efficiency versus effectiveness in time usage?

A) Mario has found that if he forgoes his exercise routine he has more time to complete his course work satisfactorily and on time.
B) Megan is very conscientious about completing all of her course work on time and understands that to do well in school one trade-off is going to be her social life.
C) Frank is able to juggle school and a social life while maintaining a 2.0 GPA.
D) Alena has found that by taking online courses, she is able to trade off the commute time for more study time.