You did not include options in your question, but based on the meaning of the word cryptic, your answer will be 'A HIDDEN MEANING'.
When you say that something is cryptic, it means that, that thing has a meaning that is mysterious or obscure.
From the way the word was used in the given sentence, it means that the message the teacher was passing across about the test is hidden, it was not understood by any of the students.
Hey there!
<span>Benjamin Franklin _______ regarded as one of the most infuential people in the history of the United States.
Answer: Is
Hope this helps
Have a great day (:
</span>
If its an analogy, Its easier to do it in a sentence.
A prodigy had a lot of talent.
The answer is, a Zealot has a lot of conviction.
( I had a question like that before that's how I know but I think its Zealot. )