The correct option is B Assertion and reason both are correct, and reason explains the assertion
Assertion and reason
Food preservatives are generally added to a variety of food items due to their function of preventing food from getting spoiled caused by some micro-organisms growth.
So, assertion is correct.
Reason
Food Preservatives inhibit the growth of microorganisms and thus prevents the food from spoilage.
So, reason is correct.
Hence, assertion and reason both are correct, and reason explains the assertion.