Directions: The following question contains three sentences labeled as A, B, and C, each with a highlighted word. Identify the word from the given options that is the synonym of all three highlighted words.

A: The philosophy professor's lecture on Plato was 'enlightening', shedding light on complex ideas with clarity.

B: Her 'illuminating' remarks on the subject provided new insights and perspectives.

C: The documentary offered an 'instructive' view into the life and thoughts of the philosopher.