Reading accuracy of stop watch

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right

your answer is c! hope this : )