Answer:
A. Grinde and Johansen’s theory is mostly incorrect.
Step-by-step explanation:
A. is the right answer. The author concludes that the essay in question found Grinde’s and Johansen's theory to be “unfounded” which means it is not based on the evident and objective facts, and that it is incorrect.
B. is not the correct answer. The author does not talk about the clarity of the theory.
C. is not the right answer. The author dismisses the theory completely.
D. is not the right answer. The author says the theory is “unfounded” which can’t mean it’s correct.