According to krashen, the sequence in which second language learners acquire language forms is similar to the sequence in which they acquire their first language. this is referred to

The answer is natural order.

Explanation:

This hypothesis explains that children acquire language in a natural (fixed) order, and according to Krashen, this process occurs both for the first and second language.

Krashen rejected grammar-based education of languages if the goal was its acquisition. Instead, he assumed that people will, sooner or later, acquire a language through exposure and interaction.