Although the meanings of words may

Although the meanings of words may necessarily be liable to change, it does not follow that the lexicographer is therefore unable to render spelling, in a great measure, -------.
(A) arbitrary (B) superfluous © interesting (D) flexible (E) constant
I thing (d) is the correct answer. Am I correct?
What does “necessarily” suggest?
What is the sense of the bold part?

Probably (a) but it looks as if this is context dependent and the view previously lais out should be taken into consideration.
(I think it’s A because the writer has just said that meanings can change but it DOES NOT follow that spelling should do something. I assume, with no further context, that he is saying it does not follow that spelling can change so easily.)

necessarily - there is some necessity for the word meaning to change.

I’ve excplained the meaning of the bold part in my first paragraph.

  1. Can we sense what kind of necessities are speaking about?
  2. Does “in a great measure” “mean in large scale”?
  3. Does “it does not follow” mean “it does not mean”?
  1. Presumably this was covered in the previous part of the writing.
  2. It means ‘to a great extent’.
  3. yes, in a way. Although (A) is the case, the same does not apply to (B).