Acid without water:
A.does not dissociate into hydrogen ions
B.dissociates into hydrogen ions
C.sometimes dissociates into hydroxyl ions
D.dissociates into hydronium ion

Hint:Acids are defined as chemicals which can donate a proton, i.e. hydrogen ion. In order to dissociate, it must have a medium. Water acts as a medium in which the hydrogen ions can freely move around.

Complete step by step answer:
The acids donate protons which in order to do so, they must dissociate so that the ions can move about freely. When acid is added to water, it acts as a medium and allows the ions to dissociate and move around freely. The strength of an acid depends on its ability to dissociate into water. Stronger acids have $100\% $ dissociation while weak acids do not. The reaction of acids occurs as:
${\text{HA}}\left( {{\text{aq}}} \right){\text{ }} \to {\text{ }}{{\text{H}}^ + }\left( {{\text{aq}}} \right) + {\text{ }}{{\text{A}}^ - }\left( {{\text{aq}}} \right)$ where HA is the acid which dissociates into hydrogen ion and its conjugate base.
Thus, we can say that without water, acids will most likely be useless as they cannot dissociate into hydrogen ions.

$\therefore $ The correct option will be option A, i.e. it does not dissociate into hydrogen ions.

Note:
Acids are defined by three concepts:
-Arrhenius acids: acids are substances which when added to water will increase the concentration of hydrogen ions in it.
-Bronsted – Lowry acids: acids are substances which donate a proton or hydrogen ion when added to a solution.
-Lewis acids: acids are substances which accept an electron pair in their vacant orbital. Thus, only the species with vacant orbitals can act as acids.