Correct Answer: flaw

Solution : The second option is correct.

Defect is a shortcoming, imperfection, or lack.

Flaw is a mark, fault, or other imperfection that mars a substance or object.

• Let's look at the meanings of the other given options:
  • Care is the provision of what is necessary for the health, welfare, maintenance, and protection of someone or something.
  • Fact is a thing that is known or proved to be true.
  • Sound denotes the vibrations that travel through the air or another medium. and can be heard when they reach a person's or animal's ear.

Hence, from the given meanings, we find that defect and flaw are synonyms.