Is your story in 1st 2nd or 3rd person?
I would personally start your story with the character already in the 'city' where possibly during work he would reminisce about his old country town.
Thats correct. As you stated by lenz's law the direction of the induced current will oppose the change that caused it i.e induced a magnetic field upwards .
Hence the only possible answer that will produce a magnetic field upwards is either B or D, the anticlockwise direction (Right hand grip...
When we halve the interval and sub the value into that equation it will give us +0.005 rather than negative and ultimately will give us an answer of 0.6 which is not the case