Rande Contractually Agreed to Purchase His Electricity, for Two Years

Rande contractually agreed to purchase his electricity, for two years, from Metro Power Inc. Six months after that contract was signed, Metro Power increased its prices by ten per cent, as it was permitted to do under the agreement. It then insisted that Rande pay at the new rate for the remaining time under the contract. Although Rande realized that Metro Power had acted in accordance with the law, he is very upset about the price hike. Assuming that the default rules of contract apply,

A) Rande is entitled to protest by paying his monthly bill with a dozen or more cheques which add up to the correct amount.
B) Rande must pay as promised, even though he is unhappy with Metro Power's actions.
C) Rande is entitled to protest by paying his monthly bill with any number of bills and coins he happens to have on hand.
D) Rande is entitled to protest by paying his monthly bills with foreign currency.
E) Rande is entitled to protest by paying only when a representative from Metro Power has come to his house to collect payment on his monthly bills.