Which of the following phrases might cause trouble for multilingual learners to understand?

The phrase "I'm going to hit the hay" is a common idiom in English that means "I'm going to bed" or "I'm going to sleep." For multilingual learners, this phrase can cause confusion because it uses figurative language rather than literal terms. Idioms often do not translate well into other languages and can lead to misunderstanding if the learners are not familiar with the expression's cultural context.

In contrast, the other options presented involve more straightforward language. "Can you pass the salt?" is a simple request involving clear actions that are understandable to most learners. "What time is it?" is a direct question that involves common vocabulary related to telling time, and "How are you?" is a basic greeting that typically requires little cultural background to comprehend. These expressions are likely to be more accessible to learners who may not be fluent in English.