Which one of the following is a total root parasite?

Explanation:
Balanophora / Orobanche for its survival is known to suck water, sugar and minerals from the roots of its host plant.
It is responsible for perishing the survival and growth of the host plant and eventually leading to the death of the host plant.

Final Answer:
Hence, the correct answer is option A: Balanophora / Orobanche is the correct answer.