Which of the following events occurred in may 1945 a: the d-day landing b: the battle of stalingrad c: the german surrender d: the potsdam conference

This is what i found on google “the first mobile phone call was made 40 years ago today. on april 3, 1973, motorola employee martin cooper stood in midtown manhattan and placed a call to the headquarters of bell labs in new jersey.” i hope this you for what your looking.

The theory is land mass basically what they said.