Answer:
The correct answer is: B. After graduating from St. Louis University in just three years, Sharon was quickly hired by a major corporation.
Step-by-step explanation:
We have very similar sentences, however letter B is the correct one. Firstly. because we don't use "The" when the name of the University comes first, for instance, if instead of St. Louis University, the sentence had said "University if St. Louis, then "The" would have come first: The University of St. Louis. Then, we have, "a" or "the" for referring to a random company, which is very important, but we don't know its name; here, we have to use "a" and not "the" for this reason