Final answer:
The expression -33 + (-1) results in -34, which means the correct answer is D. -34.
Step-by-step explanation:
Adding negative numbers will always produce a sum whose value will be less than the value of the greater number out of the two numbers that need to be added. The correct answer to the expression -33 + (-1) is found by adding the two negative numbers. According to the rules of addition for negative numbers, when two negative numbers are added together, the result is also negative, and their absolute values are summed. Thus:
-33 + (-1) = -(33 + 1) = -34.
Therefore, the correct answer is D. -34.