In the Parable of the Persistent Friend (Luke 11:5-8), what core principle about prayer does Jesus primarily illustrate?

A God always grants immediate answers to every request, regardless of the timing or nature of the prayer. B Importunity and persistence in prayer, even when seemingly inconvenient or bothersome, can lead to favorable responses. C Prayer should be reserved for times of extreme need and should not be used for trivial matters. D God is more likely to answer the prayers of those who are socially influential and respected.