In the Parable of the Sower, what does the seed that falls on rocky ground represent?

A Those who hear the word and immediately receive it with joy, but have no root in themselves. B Those who hear the word, but the worries of this life and the deceitfulness of wealth choke it. C Those who hear the word and understand it; they produce a crop, yielding a hundred, sixty or thirty times what was sown. D Those who do not hear the word at all.