Arif who is 65 years old, promised to pay for his sister's wedding at a hotel in Bali. he has now changed his mind. is arif under any legal obligation to fulfil his promise to his sister?

a. yes, arif's consent was freely given by him

b. yes, there is a fiduciary relation between arif and his sister

c. no, there was no intention to create legal relations between the parties

d. no, arif has no capacity to make a contract as he is too old to do so