Here, it's necessary to explain, what is the Read Option Offense?
First, the Read Option and Read Defense are two different things.
Read Defense is the job every quarterback has to complete before the snap, like Peyton Manning, a top strategic master, can often break down the opponent's tactics by reading the defense and temporarily modify his tactics ten or fifteen seconds before the snap, thereby creating passing opportunities for himself.
This action occurs before the snap.
But the Read Option occurs after the snap.
The so-called Read Option means the quarterback, by closely watching the movements of the opposing linebackers after the snap, decides his offensive strategy in a flash:
If the linebacker covers the running back, then the quarterback will carry the ball and advance on the ground himself.
If the linebacker covers the quarterback, then the quarterback will hand the football to the running back, who will then advance on the ground.