What did the Secretary-General talk to a group of students at U. N. headquarters？A．He hope

What did the Secretary-General talk to a group of students at U. N. headquarters？

A．He hoped the students to promote America"s role in reducing gas emissions.

B．He expected the American government to participate in the Kyoto treaty.

C．He praised America"s role in reducing greenhouse gas emissions.

D．He criticized America"s reluctance in joining in the Kyoto treaty.