Choice-B is the true one.
Answer:The place to go for the answer to such an easy question is the SI Brochure, the document which defines the SI and all its units.
Electric field due to a point charge is given as

here we know that

also the distance is given as

now we will have

so we will have

so above is the electric field due to proton
The answer would be 2.63. Your welcome. This has been changed to the correct answer.