Within classical Indian philosophical thought, what does 'Dharma'—one of the four fundamental aims of life (Purusharthas)—primarily signify?

The correct option is Adherence to ethical duty and righteous living.

Explanation:
In classical Indian philosophy, human life is structured around four fundamental aims or values known as the Purusharthas. These four goals are:

1. Dharma: Moral law, ethical duty, righteousness, and order that sustain individual and social harmony.
2. Artha: Material wealth, economic prosperity, and security necessary for maintaining life.
3. Kama: Sensual pleasure, affective desires, love, and aesthetic enjoyment.
4. Moksha: Ultimate spiritual liberation, self-realization, and release from the cycle of birth and death.

Among these, Dharma serves as the foundational principle that guides moral action and righteous living.