Concept:Joint supply occurs when two or more products are obtained together from a single raw material or production process.Explanation:Palm oil and palm kernel are both derived from the same oil palm fruit.When the palm fruit is processed, the flesh yields palm oil, while the inner seed yields palm kernel.These two products cannot be produced separately from the fruit; they arise jointly from the same source.Therefore, an increase or decrease in the processing of palm fruit affects the supply of both goods together.This makes them a clear example of goods in joint supply.Answer:Joint supplyOption C.