Which of the statements given below regarding Hindustani classical music is/are correct?
I. The Khayal form offers artists a wider scope for spontaneous creative interpretation.
II. Its evolution occurred subsequent to the emergence of the Dhrupad genre.

The correct answer is Both I and II.

Let us analyze each statement regarding Hindustani classical music step-by-step:

Analysis of Statement I:
The word Khayal (or Khyal) is derived from a Persian/Arabic word meaning "thought", "idea", or "imagination". Unlike the traditional Dhrupad style—which is highly structured, solemn, and strictly bound by canonical rules—Khayal places a central emphasis on artistic imagination and improvisational freedom. It allows singers a wider scope for spontaneous embellishments, intricate melodic variations (taans), textual improvisation (bol-taans), and expressive ornamentation within the framework of the chosen raga. Therefore, Statement I is correct.

Analysis of Statement II:
Dhrupad is the oldest surviving genre of Hindustani classical vocal music, reaching its grand pinnacle during the 16th century in the Mughal courts (notably associated with Swami Haridas, Tansen, and Baiju Bawra). The Khayal style evolved as a distinct and dominant genre subsequent to Dhrupad, gaining immense popularity in the late 17th and 18th centuries, particularly credited to court musicians like Niamat Khan (Sadarang) and Firoz Khan (Adarang) during the reign of Mughal Emperor Muhammad Shah. Hence, its evolution occurred subsequent to the emergence of Dhrupad. Therefore, Statement II is correct.

Since both Statement I and Statement II are correct, the correct choice is Both I and II.