A \( \mathrm{C}_{6}-\mathrm{C}_{7} \)
B \( \mathrm{C}_{18}-\mathrm{C}_{25} \)
C \( \mathrm{C}_{25}-\mathrm{C}_{40} \)
D \( \mathrm{C}_{5}-\mathrm{C}_{12} \)
Correct Answer: Option D
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