I need to know how exactly you get the final temperature from this setup as its confusing how we get the final temperature from this. ​

Good moring let me you on this question the answer the electric force  have a good day ; )

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

This ain't even a question. speak english

There are no answer choices, but a metaphor is a comparison between two objects that are not usually related without using like or as.