In the Parable of the Sower (Matthew 13:1-23), what does the seed that falls on rocky ground primarily represent concerning those who initially receive the word?

A Those who diligently study the scriptures but struggle to understand them. B Those who joyfully accept the word but lack deep roots and fall away when trials arise. C Those who are hardened by sin and completely reject the message. D Those who are distracted by worldly concerns and forget the teachings.