The correct option is C 3500
We know that,
1 kg = 1000 g
Half kg = 1000 ÷ 2 = 500 g
Ram bought three and a half kg of sugar.
That is equal to
= 3 kg + 500 g
= 3 x 1000 + 500
= 3000 + 500
= 3500 g
Therefore, the total amount of sugar bought by Ram is 3500 grams.