The professor's lecture aimed to _______ the complex theory of relativity, breaking it down into easily digestible components for the undergraduate students.

✓ Correct Answer: Option C

The lecture 'breaking it down into easily digestible components' indicates the goal was to make it clear. Both 'elucidate' and 'clarify' mean to make something clear or explain it. 'Obscure' and 'obfuscate' mean to make something unclear.