Which of the following statements is the central idea of Churchill's thesis in the speech "We Shall Fight on the Beaches"?

A) The fatalities Britain suffered in the Battle of Gazala will be difficult to recuperate from.

B) Despite setbacks and a difficult enemy, Great Britain will never surrender.

C) The number of lives the war has claimed has created a scarcity of military personnel.

D) The military losses Britain has endured will limit the expansion of their military strength.