Which of the following provides the strongest thesis statement?

A. the settlement and reparations from world war 1 helped cause world war 2.

B. many european cities and much of the countryside were destroyed during the wars.

C. world war 1 lasted from 1914 to 1918, while world war 2 lasted from 1939 to 1945.

D. both world war 1 and world war 2 were fought on european soil.