The correct answer is Option A.
DIALECTIC is the art of investigating and reasoning the truth of opinions. Other words for dialectic are ARGUMENTATION, REASONING and LOGIC.
Thus ARGUMENTATIVE is the correct answer.
The remaining options are incorrect because:
Instructive means useful and informative.
Constructive means something that is intended to have a useful purpose.
Destructive means something that causes harm and damage.
Thus Option A is the correct answer.