Electrophilic halogenation of 4-halo-3-(tert-butyl)phenols
The options ABC are correct answers 
Reason: 


A: Steric effect of halogens will definitely be taken into account since all 3 halogens are acting on the same compound hence the primary factor which will make the product formed for each case be different is the steric hindrance due to their respective sizes. 
B: For steric hindrance to be taken into account both atoms need to be bulky and have equal role to play in the first option we affirmed that due to different sizes among halogens there'll be steric hindrance causing different types of products to be formed however that is only true when we have a bulky group( here, tert butyl) providing steric to the group trying to attach(the halogens) to the adjacent c atoms. Hence for us to take steric hindrance as a factor for different products the steric hindrance caused due to the tert-butyl group and halogens is considered 
C: The substitution of the halogens is taking place due to the +M effect of the -OH group thus option C must be true for us to proceed even a bit and it is the first requirement and only after this would we take into consideration the steric hindrance. In other words the reaction is taking place due to the electron donating effect of the -OH group since it is donating electrons to the ring via mesomeric and not inductive. And the steric hindrance serves so as to differentiate and predict which product will be formed