Roughing the "passer"

[MD Longhorn]

NFL, NCAA, NFHS, Canadian Rulings:

On these plays, the "Tackle" is something you would not rule as unnecessary roughness against a normal player, but something that if performed on a QB behind the line, you WOULD rule as roughing the passer.

A) RB#34 is 10 yards past the line of scrimmage when he attempts to pass the ball downfield to WR#80. RB is then tackled as above. Ruling?

B) RB#34 is 10 yards past the line of scrimmage when he attempts to throw a backward pass across the field to WR#80. RB is then tackled as above. Ruling?

C) RB#34 is 10 yards past the line of scrimmage when he attempts to throw a backward pass across the field to WR#80. Due to wind, the ball actually ends up going 2 yards forward before caught by WR#80. While the ball is in the air, RB is tackled as above. Ruling?