Answer : Here options are not given to choose. But still it can be answered based on basic knowledge which are following.
1) The supply of tractors can increase if new developed technology is used to produce tractors. Because this new developed technology will increase the production of tractors.
2) If input cost decrease tractors production then the producer will produce more tractors. This will increase the supply of tractors.
3) If producers' expectation about future sale is positive then the producer will produce more tractors. This will increase the supply of tractors.
4) If the number of tractor seller increase then also the market supply for tractors increase.
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