I picked B here because in line 24 the passage states, "uncertainties abound" which I thought was captured by B's use of the word "ambiguous". Also, in line 35-39 the passage states that the valuations did not take into account a business's goodwill which would today be a large fraction of market value. And, I thought this corresponded pretty well with answer choice B's use of the term "outdated".
That was my thought process in choosing B. Why is D better than B?