Who was the President of Pakistan at the time of the 18th Constitutional Amendment in 2010?

Asif Ali Zardari was the President of Pakistan when the landmark 18th Constitutional Amendment was passed in 2010. This amendment was a significant legislative achievement, restoring the 1973 Constitution to its original parliamentary form, curtailing presidential powers, and removing the president's authority to unilaterally dissolve parliament. Option A (Mamnoon Hussain) became President much later (2013-2018). Option B (Pervez Musharraf) was President before Zardari, resigning in 2008. Option D (Arif Alvi) became President even later (2018-present). Thus, Asif Ali Zardari was the head of state during this crucial constitutional reform.