Which one of the following categories of Fundamental Rights incorporates protection against untouchability as a form of discrimination?

The correct option is Right to Equality.

Detailed Explanation:
The Constitution of India guarantees six fundamental rights to its citizens. Among these, the Right to Equality is a critical category spanned across Articles 14 to 18.
Specifically, Article 17 of the Indian Constitution addresses the abolition of "untouchability". It explicitly states that "Untouchability" is abolished and its practice in any form is forbidden. Furthermore, the enforcement of any disability arising out of "Untouchability" shall be an offence punishable in accordance with law.
Since Article 17 is positioned under the broader heading of the Right to Equality (which includes Articles 14 to 18), the protection against untouchability as a form of discrimination is incorporated within the Right to Equality.

Let's briefly review the other options to understand why they do not apply:
• Right against Exploitation (Articles 23 and 24): Covers prohibition of traffic in human beings, forced labor, and employment of children in factories.
• Right to Freedom (Articles 19 to 22): Covers freedom of speech, expression, assembly, association, movement, residence, and profession.
• Right to Constitutional Remedies (Article 32): Empowers citizens to move the Supreme Court for the enforcement of their Fundamental Rights.