Final answer:
Robert Frost's poetry is modern yet reflects the timeless quality of everyday life and nature, making his work a blend of modernist and traditional elements that appeals to a wide audience.
Step-by-step explanation:
The correct answer is b) Modern. Despite the fact that Robert Frost is part of the modernist tradition, his poetry possesses a timeless quality that reflects the simple beauty of the natural world and everyday life. His works like "The Road Not Taken" and "After Apple Picking" exemplify this fusion of modern sensibilities with themes that resonate with a simpler, bygone era. Frost's poetry is characterized by its clear and accessible language, and while drawing material from New England's natural scenery, it often explores universal themes. This juxtaposition of modern and traditional elements contributes to the enduring popularity of Frost's poetry, as it encourages readers to pause and appreciate the simple things in life.