Choose the agreement that must be in writing in order to be enforceable: Select one: O a. Arya agrees to sell camping supplies to Igor for $25. b. Ivan agrees to provide housecleaning services to Natasha for $250 per month. c. Sarah executes a guarantee of the debts of her business, Sarah's Baked Delights Ltd., in favour of XYZ Bank. d. In December, 2020, a greenhouse agrees to supply flowers and shrubs for July 1 celebrations in 2021. Amy agrees to pay Harpreet $200 a month to mow her lawn until Harpreet finishes law school in the fall of 2022. This is an example of: Select one: Oa. A penalty clause. b. A condition subsequent. c. An accelerated payment. d. A condition precedent