To create a firewise home, the owners should focus on choices that minimize the risk of fire spreading to the house. Based on the options provided, the following two changes would be the most beneficial:
B. Increase the space between the tree line and the house - This helps reduce the likelihood of fire reaching the home from nearby vegetation.
C. Replace wooden exterior with non-combustible siding - Non-combustible materials are less likely to ignite in the event of a fire.
The other options would increase the risk of fire damage and are not recommended for a firewise approach.