Food preservatives prevent spoilage of food due to microbial growth. The most commonly used preservatives includes

• A

  Table salt and sugar
• B

  Vegetable oils and sodium benzoate $\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{N}\mathrm{a}\right)$ .
• C

  Salts of sorbic acid and propanoic acid.
• Correct answer
  D

  All of these

Hence, the correct answer is option: 'D'.