The correct statement or statements are,
I. Soap is excellent for cleaning, 100% broken down by bacteria in rivers and hence has no further environmental damaging repercussions.
II. Soap forms an insoluble precipitate or scum when hard water containing calcium and magnesium ions is used.
III. Soaps can be used for cleansing under acidic solutions.

A

Only I

B

Only II

C

Only III

D

I and III