A teacher plans a lesson to enhance students' comprehension and interpretation skills by focusing on context clues, word morphology, and syntactic structures.
During the lesson, students are given the following sentence to analyze:

Despite the ostensibly jubilant atmosphere, the protagonist's inner turmoil was palpable, rendering the scene profoundly melancholic.

Which of the following techniques would most effectively teach students to interpret the meaning of the word "ostensibly" within this context?