Answer:
Option B is correct. 
Step-by-step explanation:
Given the charge, Q = 12uC 
Now convert the uC into C = 5*10^-6 C 
Given, d = 0.020 m 
Now use the below formula: 
E = K*Q/d^2 
Now insert all the values in the above formula and then solve. 
E = (9 ×10^9) × (12×10^-6) / (0.020)^2 
E = 2.7 ×10^8 N/C 
Therefore option B is correct.