B.
<span>Unemployment is high in many fields, but there are jobs available in telecommunications.
A comma is used when it is placed after the end of one independent clause and the beginning of another which follows one such clause. The two independent clauses must be joined with words known as co-ordinating conjunctions. Examples of such words are, but, and,or so etc.
In this sentence but is used, </span>preceded by a comma so it is the right one.
<span>Some of the students
<u>h</u><u>ave been</u> applying to out-of-state colleges.
It cannot be 'had' because it says <em>apply
ing.
</em>It cannot be 'has been' either because it says <em>
Some of the student
s. </em>(Has doesn't match plural verbs)<em>
</em></span>