The correct answer is c. This allows extra time for whatever assignment or project you may be doing, big or small. If you only allow a very specific amount of time, you may misjudge.
Andy seems to be the most likely to be the noun, if this is so then it should be 2.
Answer:
Marlena, who enjoys many different subjects, likes history and geography the best. The nonrestricitve modifier is: who enjoys many different subjects.
Explanation:
