"Such a link" in the passage refers most probably to ______.

A．IPCC and climate changes

B．global temperatures and sea levels

C．natural changes and human activities

D．human activities and temperature rises

假定如下运算法则：x△y=x-y÷2，根据该运算法则，(7△10)△4的值为：

A．3

B．2

C．1

D．0