To evaluate the expression \( c - d - 2 \) when \( c = -1 \) and \( d = 15 \), we can substitute the values of \( c \) and \( d \) into the expression:
\[ c - d - 2 = -1 - 15 - 2 \]
Now, we perform the calculations step by step:
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Calculate \( -1 - 15 \): \[ -1 - 15 = -16 \]
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Now subtract 2 from -16: \[ -16 - 2 = -18 \]
Thus, the value of the expression \( c - d - 2 \) is \( -18 \).
However, this answer does not match the given responses. If we check for a mistake, it seems the responses provided do not include \( -18 \).
Please clarify if there is a different expression to evaluate or if any of the values need to be changed.