In a ripple counter,

[A].	whenever a flip flop sets to 1, the next higher FF toggles
[B].	whenever a flip flop sets to 0, the next higher FF remains unchanged
[C].	whenever a flip flop sets to 1, the next higher FF faces race condition
[D].	whenever a flip flop sets to 0, the next higher FF faces race condition

Answer: Option A

Explanation:

In a ripple counter the effect ripples through the counter.