Concept:Conservation means reducing the demand for a natural resource so that it is not depleted.
Explanation:Matchsticks are traditionally made from wood obtained from trees.
Using a lighter avoids the use of wooden matchsticks.
This reduces the number of trees cut down for making matchsticks.
Therefore, the practice helps in preserving forests.
Petroleum, water, and wildlife are not directly saved by this action.
Answer:The correct option is B. forest.