The heads of the G-20 nations identified several pillars of their reform agenda in the declaration at the Toronto Summit in June 2010. These pillars aimed to strengthen the global financial system and prevent future crises.

Option 1, "Relaxing regulatory framework," was not identified as one of the pillars in this declaration. This means that the G-20 leaders did not prioritize relaxing regulations as part of their reform agenda.

Option 2, "Effective supervision," was identified as a pillar of the reform agenda. This involves implementing robust supervision mechanisms to ensure the stability and integrity of financial institutions.

Option 3, "Resolution and addressing systemic institutions," was also identified as a pillar. This refers to developing plans and mechanisms to handle the failure of systemically important financial institutions, reducing the risk of contagion and disruptions to the wider economy.

Option 4, "Transparent international assessment and peer review," was also identified as a pillar. This involves establishing processes for evaluating and reviewing financial systems and regulatory frameworks to ensure transparency and accountability.

In summary, the correct answer is option 1 because relaxing the regulatory framework was not identified as a pillar of the reform agenda by the G-20 leaders at the Toronto Summit in June 2010.