Final answer:
The electric field at point b in this situation will point towards the left.
Step-by-step explanation:
The direction of the electric field at point b in this situation can be determined by considering the given information. The diagram shows the electric field created by two parallel metal plates, and the question asks about the direction at point b.
To determine the direction of the electric field, we need to understand that the electric field lines always point from positive charges to negative charges. In the given diagram, the positive charge is located to the left of point b, so the electric field at point b will point towards the left, which corresponds to option C: Left.