Which of the following is NOT one of the hypotheses put forward

Which of the following is NOT one of the hypotheses put forward by Stephen Krashen?
A、The acquisition-learning hypothesis.
B、The natural order hypothesis.
C、The input hypothesis
D、The hypothesis of linguistic universals
【正确答案】：D
【题目解析】：语言共性的假设不是 stephen krashen 提出的。