Correct option is (c) Floods
The best I can explain: According to Einstein’s equation (qb/q≼qS^2/d^3/2), the sediment carrying capacity of the channel depends upon the discharge per unit width. Therefore, this gives that floods can carry more amount of sediment than any other state of water because the discharge per unit width of channel is maximum in case of floods. Most of the annual sediment load is done by floods.