In the curve of forgetting developed by Ebbinghaus, the greatest amount of forgetting occurs .

Within the first hour after learning new material

Explanation:

According to the Ebbinghaus forgetting curve, the brain's ability to retain knowledge or information recently learned, reduces over time.

It may take hours, days, weeks or months to forget information.

He states that we forget the most information within the first hour of learning it.

To avoid forgetting, recently learned information should be reviewed and revisited over time.

it should be d or b but i'm sure it's d