Final answer:
The student's question involves deciphering a simple cipher, likely a substitution cipher with a one-letter shift, changing 'QUST BR.C? RUD' to 'What Break? Code'.
Step-by-step explanation:
The student's question is a classic example of a cipher, a method for transforming text to secure its content from unwanted readers. It's likely a simple substitution cipher where each letter has been shifted a certain number in the alphabet. The question 'QUST BR.C? RUD' when decrypted, might stand for 'What Class? Next' when following a Caesar cipher with a shift of 1. Given the multiple-choice options provided, the letter that best completes the question 'QUST BR.C?' in context would be 'a) Code', making the deciphered question 'What Break? Next.'