Choose the word that is closest in meaning (synonym) to

Solution

Obfuscate means to deliberately make something unclear, confusing, or difficult to understand. Complicate means to make something more complex or difficult, which is the closest in meaning. Now understand why others are incorrect: Clarify → means make clear (opposite) Simplify → means make easier (opposite) Illuminate → means to explain or make something clear (opposite in context) Since obfuscate implies creating confusion, complicate is the best synonym.