The answer is either A or C, but I would choose A.
For research-be it self research or school research (project)
Answer:
The prepositional phrase in this sentence would be "Between Louisiana and East Texas"
Explanation:
A preposition is noun or pronoun expressing a relation to another word or element in the clause, as in "she hid <u>under</u> the covers" In this case, the preposition is the word "between", therefore, the prepositional phrase is "between Louisiana and East Texas"