What Does G Stand for in the Following Equation $$F = \frac { G m _ { 1 } m _ { 2 } } { r ^ { 2 } }$$

Multiple Choice

What does G stand for in the following equation? $$F = \frac { G m _ { 1 } m _ { 2 } } { r ^ { 2 } }$$

A) Gravity
B) Universal gravitational constant
C) Liters
D) Weight