Which option is the best revision of the sentence?

Isobel was sick last weke so she missed to days of classes.

A. Isobel was sick last week, so she missed two days of classes.

B. Isobel was sick last week so she missed to days of classes,

C. Isobel was sick last weke so she missed two days of classes.

D. Isobel was sick last weke, so she missed to days of classes.