In the Figure, an Airport Luggage-Carrying Train with a Tractor

Multiple Choice

In the figure, an airport luggage-carrying train with a tractor T is pulling three luggage carts, M₁, M₂, and M₃ with an acceleration of 1.2 m/s². If T = 300 kg, M₁ = 200 kg, M₂ = 100 kg, and M₃ = 100 kg, and air resistance is negligible, then the tension in the connection between cart M₂ and cart M₁ is

A) 840 N.
B) 480 N.
C) 240 N.
D) 120 N.
E) 0 N.