Clock A shows a time and clock B a later time (long orange hand for minutes, short hand for hours). Clock C is moved on by the same amount. Which clock shows the result?

A shows 3:00 and B shows 4:30, so the time moves on by 1 hour 30 minutes. C shows 7:10, and 1 hour 30 minutes later it is 8:40: the minute hand points to 8 and the hour hand sits two thirds of the way from 8 to 9: (c). (a) adds only 1 hour, (b) adds 2 hours 30 minutes and (d) goes back instead of forwards.