The correct answer is 'their'
Because the x was this and plus that and plus all that other stuff
Answer:
The speaker is talking about their journey and how it isn't to accomplish anything. In their perspective, they are scaling a "metaphorical mountain" for no specific reason.
...a type of commitment in which the parents of a boy and agirl agreeon having them marry.
According to the information available on this excerpt, a betrothal is a promise which can be later modified, in which the parents of a boy and a girl promise to marry them. This could also be a definition of arranged marriage.