Question

The remark was so _____ that Emily, who is not usually sensitive to such lapses in taste, gave a gasp of surprise.

negligible
ponderous
complicated
inappropriate

Answer 1

Innappropriate
It is the only one that makes sense in the sentence.
The remark was so inappropriate that Emily, who is not usually sensitive to such lapses in taste, have a gasp of surprise.
See what I mean? I hope this helps!

Answer 2

The remark was so _____ that Emily, who is not usually sensitive to such lapses in taste, gave a gasp of surprise.

inappropriate