Answer:C ) The rows must be hooked up parallel or all the rows of light would either turn on or off.
Step-by-step explanation:
1. Because if the rows would be in series then turning on one/off row means turning on/off all the rows respectively. So option B is totally incorrect.
2. If they are in series its obvious that all the rows would either on or off. So option "A" is incorrect because of its argument.
3. Again if they are in series it doesn't mean that they could only be controlled by one switch thats why option "D" is incorrect.
So only option C is correct with logical argument.