. In a certain region of space with volume \(0.2 \mathrm{~m}^{3}\), the electric potential is found to be \(5 \mathrm{~V}\) throughout. The magnitude of electric field in this region is:
A zero
B \(0.5 \mathrm{~N} / \mathrm{C}\)
c \(1 \mathrm{~N} / \mathrm{C}\)
D \(5 \mathrm{~N} / \mathrm{C}\)