Never study "de jure" alone. It travels as one half of a pair with "de facto", and the pair exists to mark the gap between paper and reality. "De" means of or concerning, and "jure" comes from "jus", law or right, which you already know from jurisdiction, jurist and jury. Put together, de jure describes what the law says, while de facto describes what is actually going on.
Take a familiar example. Segregation in the United States was de jure while statutes required it, and became de facto once the statutes fell but the pattern of living continued. The phrase always points to the legal position. Option (C) is the answer.
Let's summarize:
The correct option is (C), concerning law.
LIST I | LIST II (Meaning) | ||
| A | Break into | I | in search of |
| B | Cut down | II | wear |
| C | Look out for | III | enter by force |
| D | Put on | IV | reduce |