Use the Figure 4-11 and the Information Below to Answer

Use the Figure 4-11 and the information below to answer the following question(s) .
A train consists of a caboose (mass = 1000 kg) , a car (mass 2000 kg) , and an engine car (mass 2000 kg) .

-Refer to Figure 4-11. If the train has an acceleration of 5.50 m/s², then the tension force in the coupling between the middle car and the engine car is

A) 16.5 kN.
B) 27.5 kN.
C) 5.50 kN.
D) 11.0 kN.
E) 8.25 kN.