In the Parable of the Sower (Matthew 13), what does the seed that falls on the path represent?

A Those who hear the word but do not understand it, and the evil one snatches away what was sown in their hearts. B Those who receive the word with joy, but have no root in themselves, and endure only for a while. C Those who hear the word, but the cares of the world and the lure of wealth choke the word, and it proves unfruitful. D Those who hear the word and understand it, who indeed bear fruit and yield, in one case a hundredfold, in another sixty, and in another thirty.