How is the reaction quotient used to determine whether a reaction is at equilibrium?

i'm hoping this is like a multiple answer question. if it is then it would be, the location of the plants and also the height of the plants since one she wants to know where in her garden the chamomile grows best. but also to see which plants grew better in the location she also has to measure the plant itself. (if you can only choose one answer than it would be c).

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong