i think its c. im not too shore but i think its c
big fish in the sea . Melodee Leigh-Ann Latham
It's a piece of cake It's easy by itself
It's raining cats and dogs It's raining hard by itself
Kill two birds with one stone Get two things done with a single action by itself
Let the cat out of the bag Give away a secret as part of a sentence
Awinita Is not American and probably from a third world country or something i.d.k.
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.