Answer: a. Pink in acidic medium, yellow in basic medium
Step-by-step explanation: Methyl orange is a type of pH indicator which is used in the titration of acids and bases in order to achieve an end point in the process so as to determine the amount of acid that has been neutralized by the base itself.
The color it presents in acidic medium is red rather pink and it actually shows yellow color in basic medium.
It turns red below 3.3 pH and above 4.4, it shows yellow color. Thus sometimes, it is not recommended for the neutralization reaction.