Explanation:

- In the sentence, "The questions were so elementary that anyone could pass the test," the word "elementary" means basic or simple.

- Option 1: unusual - means not typical or expected. It does not directly contrast with "elementary."

- Option 2: primary - means basic or fundamental, similar to "elementary."

- Option 3: naive - means lacking experience or sophistication. It doesn’t relate directly to complexity or simplicity.

- Option 4: advanced - means more complex or involving a higher level of understanding. This is the opposite of "elementary." Correct Answer