Kevin, the owner and manager of a large warehouse, speaks only English. He requires that all his employees speak English

[answerhappygod]

Kevin, the owner and manager of a large warehouse, speaks only
English. He requires that all his employees speak English to ensure
that communication related to work is clear and effective. A number
of non-English-speaking workers complain about the policy on the
grounds that they can converse in their native languages and still
get the job done.
If these non-English-speaking employees bring a claim of
national origin discrimination on the basis of this policy, what is
Kevin's best defense? Explain.