The correct answer is: Only II is implicit.
The statement “These apples are too cheap to be good” suggests that there is a negative correlation between price and quality. This is supported by Assumption II, which states that the lower the selling price, the inferior is the quality of the commodity. However, Assumption I and III are not supported by the statement. Assumption I states that when the apple crop is abundant, the prices go down. This is not necessarily true, as the price of apples can also be affected by other factors, such as the demand for apples. Assumption III states that very cheap apples are also good. This is also not necessarily true, as there are many factors that can affect the quality of apples, such as the type of apple, the growing conditions, and the storage conditions.
In conclusion, only Assumption II is implicit in the statement “These apples are too cheap to be good.”