A sports club has $300$ members, divided into age groups. A stratified sample of $40$ members is taken: the number chosen from an age group is (number in that group) $\times \frac{40}{300}$, rounded to the nearest whole number. Exactly $5$ members of the sample come from the Under-18 group. How many different possible sizes could the Under-18 group be?

• A$7$
• B$38$
• C$8$
• D$15$

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