Geoffrey Chaucer was an English poet considered as the greatest poet of the middle ages. He wrote in continental accentual-syllabic meter, unlike many other poets that wrote in an alliterative Anglo-Saxon meter.
From the options given the one that best fits is the B because he did not invent the decasyllabic meter but indeed he was one of the first English poets to use it. He did invent the rhyme called Rhyme royal which consisted of seven lines.
