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

In the figure,an airport luggage carrying train with a tractor T is pulling three luggage carts,M₁,M₂,and M₃.with constant velocity of 4.5 m/s.If T = 300 kg,M₁ = 200 kg,M₂ = 100 kg,and M₃ = 100 kg (there is no friction) ,then the force in the connection between the tractor T and cart M₁ is

A) 980 N.
B) 560 N.
C) 280 N.
D) 140 N.
E) 0.00 N.