Questions 73-74

As shown in the figure above, six particles, each with charge +Q, are held fixed and ate equally spaced around the circumference of a circle of radius R.
73. What is the magnitude of the resultant electric field at the center of the circle?
(A) 0
(B) 4πε06R2Q
(C) 4πε023R2Q
(D) 4πε032R2Q
(E) 2πε03R2Q