Before Plowing a Field, a Farmer Thought the Bare Field

Before plowing a field, a farmer thought the bare field looked weed-free. Three days after plowing and turning over the soil, he was amazed to see thousands of tiny seedlings. What is the most likely reason for the mass germination of seeds?

A) large seeds that needed soil disturbance to germinate
B) small seeds that needed light to germinate
C) small seeds that were scarified by exposure to the plow
D) large seeds that needed exposure to higher levels of oxygen to germinate