Concept:Total yield is obtained by multiplying the yield per hectare by the total number of hectares.Explanation:One hectare of the groundnut variety gives 350kg.The total farmland is 10 hectares.So, total yield =350×10=3,500kg.This is a simple direct multiplication because the yield per hectare remains steady.Answer:The yield on a 10-hectare farm is 3,500kg, which corresponds to option C.