If X_ij Refers to the Number of Hours Employee I $\le$

If X_ij refers to the number of hours employee i works in week j ,then to indicate that the number of working hours of 4 employees in week 3 should not exceed 160 hours,we must have a constraint of the form

A) X₁₁ + X₁₂ + X₁₃ + X₁₄ $\le$ 0 160
B) X₁₃ + X₂₃ + X₃₃ + X₄₃ $\le$ 160
C) X₃₁ + X₃₂ + X₃₃ + X₃₄ $\le$ 160
D) X₄₃ $\le$ 160