The farm appliance combine is a combined
A. Plough and Harvester
B. Seed drill cum Thresher
C. Harvester and thresher
D. Harvester cum sprayer

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Hint: The farming process involves loosening of soil, watering, seed drilling, and harvesting. All this process takes a longer time, so, to solve this problem various framing equipment have been invented to make the work easier.

Complete answer: The modern combine harvester is a machine that is designed so that it is efficient in harvesting a variety of crops. It is designed by the combination of three harvesting operations; reaping, threshing, and winnowing. It involves harvesting wheat, soyabean, barley, corn, and oats.
After the gathering of crops, it cuts them at the base, then puts them into a threshing drum where it shakes the grains away and separates the stalks and sweeps and the unwanted materials out of the machine.
This combined equipment takes less time and gives high yield.

Now lets us find the solution from the given options:
1. Plough and harvester used separate equipment as ploughing is mainly done with hands or else it can damage the crops.
2. Seed drill cum Thresher used for the drilling of seed and threshing of wheat, sunflower, paddy, etc. it is fabricated by using high quality of raw materials.
3. Harvester and thresher combine harvester use for both harvesting and threshing process. It will take less time compared to when it is done separately.
4. Harvester cum sprayer is done with equipment that helps in harvesting as well as spraying process. Carbon fibre telescoping pole is equipment used as a harvester cum sprayer.

Hence, the correct option is (C). Harvester and Thresher.

Note: Other than combine harvester there are many other equipment that are used for the farming process, like; automatic in row weeder, harvester and separator, and robotic lettuce harvester. All these equipment help the small and large scale farmers increase their yield.