A. m₁. m₂. g/(m₁ + m₂)
B. 2m₁. m₂. g/(m₁ + m₂)
C. (m₁ + m₂)/ m₁. m₂. g
D. (m₁ + m₂)/2m₁. m₂. g
Please do not use chat terms. Example: avoid using "grt" instead of "great".