In a survey, every person chose exactly one favourite from four films A, B, C and D. For a person chosen at random from the survey, $P(A) = \frac{3}{8}$, $P(B) = P(C)$, and $P(D)$ is half of $P(B)$. Fewer than 100 people took part, and the number of people who chose D is a prime number. How many different values are possible for the number of people surveyed?

• A4
• B5
• C6
• D12

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