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.
What? There’s no detail to this question
Answer:

Comic relief is used to give audiences some relief from serious themes and to help prepare them for the next serious scene.
Answer: True
How many words want to make paragraphs?
This question is incomplete. Here's the complete question.
Read Hound of the Baskervilles, by Sir Arthur Conan Doyle.
Which statement BEST summarizes the central idea of the text?
A
Dr. Mortimer has no idea what happened to his friend, Sir Baskerville, but is
being nosy and trying to get true information from Sherlock Holmes by
feeding Holmes a few facts.
B. Dr. Mortimer is suspicious that something ghostly or superstitious had a hand in the death of his friend. Sir Baskerville.
C. Dr. Mortimer does not want Sherlock Holmes to continue his investigation, so he is giving Sherlock Holmes false information without Holmes realizing it.
D
. Dr Mortimer is attempting to convince Sherlock Holmes that Sir Baskerville's butler, Barrymore, lied to the police because he had a hand in the death of Sir Baskerville
Answer: B. Dr. Mortimer is suspicious that something ghostly or superstitious had a hand in the death of his friend. Sir Baskerville.
Explanation:
Dr. James Mortimer is a family friend as well as the doctor of the Baskervilles, and the estate executor of the recently departed Sir Charles Baskerville. The Baskerville family is believed to be cursed by a sinister black hound. Mortimer thinks that Charles´death may have had something to do with that curse.