Whicch one of these subtance has a higher melting point than water flour or salt or sugar or all the above

The correct answer is:  [D]:  "all of the above" .

Note:

 Choice [A]:  "flour" ;  and:

 Choice [B]:  "salt" ;   and:

 Choice [C]:  "sugar" ; 

          →  all have a higher melting point than water.

Since:  "Choice [D]:  "all of the above" ; is an option; 

 →  The correct answer is:  Answer choice:  [D]:  "all of the above" .

Talc (french chalk) is the ingredient

Density and pressure