Class I preservative is

Answer: Option D

Preservatives are added to foods for preventing rancidity, mould growth and spoilage. There are natural and synthetic preventives, which are widely used for preventing foods from getting spoilt.
Class I preservative belongs to natural sources which also exhibit preservative effects in foods. Examples of Class I preservatives are sugar, salt, vinegar, honey, spices, edible oils, etc. Class 1 preservatives are not dangerous to health.
Class I preservatives are Sugar, Salt and Spices.