A is the right answer

B cannot be correct, because order of priority means that requirements with higher priority should be implemented first, not the other way round

Answer A - 5.3.2

B is correct. The higher priority requirement depends on the lower one hence the lower one has to be implemented first

Option B Dependencies between requirements: Some capabilities may in and of themselves provide limited value to the organization, but need to be delivered in order to support other high-value requirements. Babok v2.- Page 126

Higher difficulty requirement is dependent on the lower difficulty one.

Answer is B, but the funny thing here is that the question shows that the BAs cant understand each other. it is clear that higher req depends on the lower req so the lower should go first.

The ranking of the requirements based on their level of difficulty is fine, but you may also include a requirement's relationship to other requirements. If higher priority requirements cannot be completed until the lower priority requirements are done, then the requirements should be ordered as such for the order of implementation.

The higher priority requirement is dependent on the lower priority requirement.

I think answer B is correct. We are talking about a requirement you moved in a higher position, to be implemented first. The lower requirement (the requirement you just moved to a higher position) should be done first. Question is a bit confusing cause it says that Ralph is disagree and you have to explain him that you move a lower requirement to an higher position, so that it can be done first. High requirements are done first and that is exactly what you have done by moving a low priority to high.

Answer is B since "Dependencies" is one of the factors that influence prioritization. BABOK v3 : Prioritize Requirements 5.3.4