What colour does methyl orange generally show in a basic solution?

Correct answer: Yellow

Methyl orange is an acid–base indicator whose colour depends on the acidity of the solution. In an acidic medium it appears red, while in a basic medium it appears yellow. Since the question specifies a basic solution, the correct observation is yellow, so option C is correct. Red belongs to the acidic range; blue is associated with other indicators such as litmus, and black is not the normal methyl-orange colour.