What color does methyl orange turn in an alkali?

Methyl orange is a pH indicator that is commonly used in titrations due to its sensitivity to changes in acidity and alkalinity. In an acidic solution, methyl orange appears red, while in a neutral to alkaline solution, it turns yellow. The color change occurs typically within a pH range of approximately 3.1 to 4.4, which means that in an alkaline environment, where the pH is above 4.4, methyl orange will present a yellow color.

In the context of the choices provided, yellow is the color observed when methyl orange is in an alkaline solution, accurately reflecting its behavior as an acid-base indicator. Other color options do not represent the behavior of methyl orange accurately; for example, red would denote an acidic environment, while blue and green are not colors associated with methyl orange at any relevant pH level.