The correct answer is option 1: 1000 tons.

To understand why, let`s break down the information given in the question. The total yield of rice and wheat is stated to be 9000 tons. This means that the combined yield of these two crops is 9000 tons.

Now, we are asked to find the yield of the excess product compared to sugarcane. This implies that we need to determine the difference in yield between rice and wheat and sugarcane.

However, the question does not provide any information about the yield of sugarcane. So, without knowing the specific yield of sugarcane, we cannot accurately calculate the exact difference in yield between sugarcane and the combination of rice and wheat.

Therefore, we cannot definitively determine the correct answer based on the information provided in the question. It is possible that none of the options listed are correct.

Alert - correct answer should be "Cannot be determined without the yield of sugarcane."