Two Springs with Different Spring Constants,k₁ and K₂,are Connected as Shown

Two springs with different spring constants,k₁ and k₂,are connected as shown in the figure below.
A force F is applied to one end.The force exerted by the wall on the spring is (take + to the right)

A) 0
B) -k₁ $\Delta$ x₁
C) -k₂ $\Delta$ x₂
D) F
E) -F