Answer:
I am going next Saturday, to get my hair dyed.
Because if we say "I am going next Saturday have My hair to dye" as the option A. then that is very wrong as the there is a grammatical error and therefore option a is wrong. Option B and C both are correct as it makes sense there is no grammatical error.
Step-by-step explanation:
Option B and C can be since both makes sense.
I am going next Saturday(future)so get my hair dyed(option B) is totally correct.
Option C also makes sense as it is a future tense so
we have to use future tense.
The correct answer is (OPTION B)
Hope it helps