Which of the following questions was left unanswered by the ratification of the constitution?

The correct answer is Moksha is achieved through joining with Brahma.

The word Moksha means liberation and it is the ultimate goal of Hindu practitioners, to achieve the state of Moksha. In order to do this, you have to become one with god, and in this case that is the Brahma, who is considered by Hindu people to be the creator god of the universe in Hindu belief. If you manage to do this, you'll reach the ultimate goal.