What does “delivery” means in the context of writing an Engligh scientific paper? </p></p>

With a year's hard work, he ________ basic knowledge of Engligh. A: has caught B: has acquired C: has required D: has acknowledged

What does “delivery” means in the context of writing an Engligh scientific paper? A: The meaning of “delivery” is similar to the concept of those delivery companies. B: “Delivery” means the contributions of your research. C: “Delivery” means how much do the writers know the background of the readers. D: The “responsibility of delivery” is on the writer rather than on the reader.