Use the price-demand equation below to find the values of x for which demand is elastic and for which demand is inelastic: p=g(x)=120−0.4x.
A. Demand is elastic when x<60, and inelastic when x>60.
B. Demand is elastic when x>60, and inelastic when x<60.
C. Demand is elastic when x=60.
D. Demand is always elastic.