Synonym of STRINGENT

Answer: Option B

Shrill : (of a voice or sound) high-pitched and piercing.
Rigorous : (of a rule, system, etc.) strictly applied or adhered to.
Dry : free from moisture or liquid; not wet or moist.
Strained : showing signs of nervous tension or tiredness.
Stringent : (of regulations, requirements, or conditions) strict, precise, and exacting.

Synonym of Stringent is Rigorous