When did man begin to explore the Antarctic

A．Building dams along the coasts.
B．Setting up several summer resorts along the coasts.
C．Mapping the coast and the whole territory.
D．Setting up permanent bases on the coasts.

A．bitterly criticizes the writing style of e-mail
B．is in favor of the writing style of email
C．does not express explicitly his own attitude towards the writing style of email
D．is strongly against the substandard writing style of e-mail