Given a maximization optimal objective function value of $150$ and a shadow price for a resource constraint of $10,$ if we add one unit to the right$-$hand side of the resource constraint, How does the optimal objective function value change?

a$.$

Decrease by $10$ units

b$.$

Increase by an unknown amount

c$.$

Increase by $5$ units

d$.$

Increase by $10$ units