at least 600,000 visitors/ come/ visit/ the park/...

Câu hỏi: at least 600,000 visitors/ come/ visit/ the park/ every year

A There are at least 600,000 visitors come to visit the Park every year.

B At least 600,000 visitors who come to visit the Park every year.

C At least 600,000 visitors come to visit the Park every year.

D There were at least 600,000 visitors come to visit the Park every year.