The correct options are
A It protects the farmer from steep price falls.
B The buyers or bidders are forced to bid reasonable amounts.
C The government procures the produce at MSP if the bidders are unwilling to buy.
Minimum Support Price protects the farmer from steep falls in prices which could render the farmer penniless. At an auction, the buyers would be allowed to bid above the MSP. If no one buys the product, then the product would be procured by government agencies.