To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) We had nailed boots on - This option is correct because the passage mentions that "we had nails in the soles and heels." The nails in the boots helped with traction on the frozen ruts, making it easier to walk on the road.
Option B) It was good walking on the road - This option is incorrect because although the passage mentions that walking on the road with nailed boots was invigorating, it does not explicitly state that walking on the road was good.
Option C) The walk was refreshing - This option is incorrect because although the passage mentions that walking in the woods was lovely, it does not describe the walk on the road as refreshing.
Option D) The nails bit on the frozen roads - This option is incorrect because the passage mentions that the nails in the boots bit on the frozen ruts, not the frozen roads.
The correct answer is A) we had nailed boots on. This option is correct because the passage explicitly states that nails were present in the soles and heels of the boots, which made walking on the road with nailed boots good and invigorating.