The word" obtuse" (Line 1 ,Paragraph 1) probably means

A．Man has been at its worst since the beginning.
B．Man cannot be better even if he makes some efforts.
C．Man is in a cycle of being worse or better.
D．Something bad inside the box can make man become bad.

A．The beginning of Renaissance under the circumstance of disintegration.
B．The worst phase that mankind is at now and in the fourteenth century.
C．The book of Hundred Year's War.
D．The afflictions of the fourteenth century.