Answer:
Option a) two curves meet.
Explanation:
Given that on a supply and demand graph, equilibrium is the point where O the two curves meet.
The demand curve slopes downward with representing when prices rise demand fall such that demand * price = constant.
Supply curve denotes the price at which suppliers are sellig at the prices.
Equilibrium price is being the price at which demand = supply
Hence where the two points intersect there is an equilibrium where demand and supply curves meet.