Identify the scenario from the options below that leads to the complete dissolution of a partnership firm, rather than just a reconstitution of the partnership.

Let's evaluate how these scenarios affect the firm:\begin{itemize}\item A change in the profit-sharing ratio (\textbf{Option D}) simply results in a \textbf{reconstitution of the partnership}, meaning the firm continues running under a new agreement.\item If the business of the firm becomes illegal (\textbf{Option A}), it results in \textbf{compulsory dissolution of the firm} under Section 41 of the Indian Partnership Act, 1932. Options B and C are grounds where a court \emph{may} order dissolution, but Option A automatically and completely terminates the firm's legal existence.\end{itemize}