Since the work force is becoming increasingly competitive in light of technological advances and outsourcing,
therefore, it is even more basic for students to complete high school and attain at least a bachelor’s degree.A.
therefore, it is even more basic for students to complete high school and attain at least a bachelor’s degree.
B.
moreover, it is even more basic for students to complete high school and attain at least a bachelor’s degree.
C.
but, it is even more basic for students to complete high school and attain at least a bachelor’s degree.
D.
so it is even more basic for students to complete high school and attain at least a bachelor’s degree.
E.
it is even more basic for students to complete high school and attain at least a bachelor’s degree.
Since is a subordinate conjunction. The function of a subordinate conjunction is to add a dependent clause to an independent clause (to add more information to the independent clause). By adding such as subordinate conjunction you make a independent clause dependent.
Therefore, moreover, but & so are all redundant as the sentence already incorporates "since"