What did the man mean

A．He has to return to Washington.
B．He wants to spend the weekend with his family.
C．He hates noise at parties.
D．He is too busy.

A．raising the world's temperature only a few degrees would not do much harm to the life on earth
B．lowering the world's temperature merely a few degrees would lead many major farming areas to disaster
C．almost no temperature variations have occurred over the past decade
D．the world's temperature will remain constant in the years to come