From the list of options provided, They will keep the furniture free from c. scratches​.
What will the furniture be free from
Furniture is often protected from scratches. Keeping furniture free from scratches requires a dedicated approach, that addresses both prevention and mitigation.
This can be done in many ways such as applying felt pads to the bottom of furniture legs, especially chairs and tables that get moved frequently to create a barrier between the furniture and the floor, preventing scratches.
Furniture polishing can also help fill existing scratches in and make them less noticeable. For scratches on leather, beeswax can be used to buff out the marks.
Complete Question:
4. From what will they keep the furniture free?
a. books b. cover
c. scratches​