Which of the following represents the best alternative for the thesis statement quoted below in terms of formality?

"I'm convinced that learners can really benefit a lot from a creative teaching approach and that it can have a huge impact on learners enjoyment of learning."

 A. It is convincing that learners can certainly benefit a lot from a creative teaching approach and that it can have a significant impact on their learning experience.
 B. This essay convinces that learner's can benefit significantly from a creative teaching approach and that it can have a substantial impact on learning enjoyment.
 C. This writing argues that learners can benefit significantly from a creative teaching approach and that it can have a substantial impact on learning enjoyment.
 D. The purpose of this essay is to point out that learners can really benefit much from a creative teaching approach and that it can have a massive impact on their enjoyment of learning