Why is a truly quantitative risk analysis not possible to achieve?

Why is a truly quantitative risk analysis not possible to achieve?

A.
It is possible, which is why it is used.

B.
It assigns severity levels. Thus, it is hard to translate into monetary values.

C.
It is dealing with purely quantitative elements.

D.
Quantitative measures must be applied to qualitative elements.

Explanation:
During a risk analysis, the team is trying to properly predict the
future and all the risks that future may bring. It is a somewhat subjective exercise
and educated guessing must take place. It is very hard to properly predict that a
flood will take place once in ten years and cost a company up to $40,000 in damages,
but this is what a quantitative analysis tries to accomplish.