[单选题]
Equipotential lines repxr-n ;zfmu7l3m vq6 r7rezc; y2v h9x/u,ocpzx,cx- 6 aoat9sv*senting the corresponding potentials are shown in the dicov6ay a9xvc xu ph,o2,ts zx *9;z/c-agram, in an electric field.
Which of the following is a correct statement regarding this electric field?
A. The electric field is uniform.
B. The work done in moving an electron from P to Q is 20eV
C. The work done in moving an electron from S to Q is 20eV
D. The work done in moving an electron from R to S is 20eV
