To determine the word that is most nearly opposite in meaning to "Obscure", we first need to understand the meaning of "Obscure".
"Obscure" describes something that is not clear or is difficult to understand. It often implies being hidden from view or lacking clarity.
Now, let's examine the options:
Given these choices, Clear is the correct answer as it is the most nearly opposite in meaning to "Obscure".
Fill in the blank with the correct option.
The teacher believed that the student’s sudden lack of interest in class was an ..........., as he had always been enthusiastic and attentive.