The Number of positional isomers for the compound given are 

• The given compound is known as dinitrotoluene (DNT) which is a crystalline organic compound with having pale yellow color and is often used in dyes,  explosives, etc.  The nitro groups present in toluene often change their positions from ortho, para to meta and hence show 6 positional isomers. The 6 positional isomers of dinitrotoluene are shown below.

Therefore, option (C) is correct.