The correct answer is b) it always rises from left to right.
A supply curve illustrates the relationship between the price of a good or service and the quantity that suppliers are willing to sell. Generally, as the price increases, suppliers are more motivated to produce and sell more of the good, resulting in a positive slope from left to right. This indicates that higher prices lead to a higher quantity supplied. While there can be specific scenarios where supply may behave differently (like in cases of inelastic supply), the fundamental characteristic of a supply curve in standard economics is that it rises from left to right.