The slow down of earths rotation due to the loss of mechanical energy of earth moon system is since _______ years from earths formation.

The slow down of earths rotation due to the loss of mechanical energy

1.	The slow down of earths rotation due to the loss of mechanical energy of earth moon system is since _______ years from earths formation.
A.	1 billion
B.	2.5 billion
C.	3.5 billion
D.	4.5 billion
Answer» E.