user: Question: How many different reasons are there for the change in Connecticut (3)?
Columns: ['State (class)', 'Vacator', 'Reason for change', 'Successor', 'Date of successors formal installation']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Georgia (2)', 'James Jackson (DR)', 'Resigned sometime in 1795', 'George Walton (F)', 'Appointed November 16, 1795']
SQL:

assistant: SELECT COUNT("Reason for change") FROM "Table" WHERE "State (class)" = 'Connecticut (3)';