(10) In order to protect the validity of a degree. (11) Colleges are taking serious measures to punish those students who "buy" papers.

Item 10 in the second paragraph is a fragment. Of the possible improvements below, which is grammatically correct?
Responses
A In order to protect the validity of a degree, colleges are taking serious measures to punish those students who "buy" papers.In order to protect the validity of a degree, colleges are taking serious measures to punish those students who "buy" papers.
B In order to protect the validity of a degree. Colleges are taking serious measures to punish those students who "buy" papers.In order to protect the validity of a degree. Colleges are taking serious measures to punish those students who "buy" papers.
C In order to protect the validity of a degree: colleges are taking serious measures to punish those students who "buy" papers.In order to protect the validity of a degree: colleges are taking serious measures to punish those students who "buy" papers.
D In order to protect the validity of a degree; colleges are taking serious measures to punish those students who "buy" papers.

A In order to protect the validity of a degree, colleges are taking serious measures to punish those students who "buy" papers.