Answer:
The electric field points from left to right.
Step-by-step explanation:
If a proton is deflected to the left, it means it experienced a force in the leftward direction. Protons are positively charged particles. Therefore, the direction of the electric field (E) must be from left to right because the force on a positively charged particle (like a proton) is in the direction of the electric field.
So, the electric field points from left to right.