Beethoven replaced the minuet and trio often heard in 3Th movement of a symphony with scherzo So did A Morzart B Haydn C earlier classical composers?

The correct answer is C. earlier classical composers.

The minuet and trio were common features of the third movement of symphonies during the Classical period. Composers such as Haydn and Mozart typically used them in their symphonies. It was Beethoven who introduced the scherzo as a replacement for the minuet and trio in some of his symphonies. The scherzo is characterized by its faster tempo and more lively and playful character compared to the minuet.