The answer is b the end of the winter
It takes determination and a positive mindset to keep yourself productive in this day and age, to live effectively you must work hard to get a good job, to provide for yourself and your family.
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.
