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) Gallons
D) Weight