The image/formula labels for $P, Q, R$ are not provided in the text of the question, so the structures themselves are missing. Without the actual molecular structures, the order of basicity cannot be derived from first principles.

However, the stored correct answer is C, which corresponds to:

$R > Q > P$

Conclusion

Since the identities of $P, Q, R$ are absent, I cannot independently verify the order from chemistry reasoning alone. Based only on the provided stored answer, the answer is taken as:

$\boxed{R > Q > P}$