Ronaldo's hand ball issue

Man U won the derby in a very nervy way. 1-0 win with Rooney the goal scorer make Man City's manager, Mark Huge eats his word when he kept on playing mind games with Man U. Man U was really in control of the game until Ronaldo was sent off because of hand ball foul during corner kick. This situation make Ronaldo looks stupid and make his appearance of big game flopper more obvious. It's a corner kick and he almost head the ball, but why he handled the ball with his both hands? However there are few point of views about this situation:
1. Ronaldo claimed he heard the the referee stop the game. But it's not a really convincing reason.
2. Ronaldo miss timed to head the ball and tried to protect his face.
3. Someone pushed him and made him lost control. (Ferdinand claimed this)

P/S: Chelsea dropped all 3 points at Stamford Bridge in London Derby against Arsenal. Thanks to super Van Persie strikes. Man U is only 5 points behind leader, with a game in hand.