Okay.
The issues, which answer choice A have are:
i) "which is the most liquid of the organizational's assets" is modifying just the "10% of the organisation's cash" whereas actually "the most liquid of the organisational's assets is the organisation's cash".
ii) In an unusual spiritual ceremony for celebrating changes in season such as the emergence of the spring season, as much as 10% of the organization's cash,
disappeared and vanished completely. Here "disappeared and vanished" doesn't goes well with "changes."
Here "celebrating changes" implies that the ceremony is a continuous process and happens evertime to celebrate the emergence of spring season.
Quote:
In an unusual spiritual ceremony for celebrating changes in season such as the emergence of the spring season, as much as 10% of the organization's cash, which is the most liquid of all the organization's assets, disappeared and vanished completely
If the sentence were "In an unusual spritual ceremony, which took place in order to celebrate changes in season such as the emergence of spring season, as much as 10% of the organisational's cash, the most liquid of the organisations's assets, disappeared and vanished completely" then A could have been strong contender.
But since A has two major issues, it CANNOT be correct.
As soon as I read "unusual spiritual ceremony for celebrating changes", I started waiting for something like D. Thus D became a straight shot.
Hope that helps.