The correct answer is accidentally!
This is the only correct answer
Hope this helps
Typically a classical symphony especially in the 18th century followed a distinct order of sonata-allegro for an opening or as an introductory. Then the theme and variations which would give way to the minuet and trio. Lastly you can use the rondo and also a sonata I believe. That's just from my experiences from listening to multiple sources of compositions.
