Correct Answer & Explanation
Option A
• The word 'Deficient' means not having enough of a specified quality or ingredient; lacking. Among the given options:
• 'Inadequate' means lacking the quality or quantity required; insufficient.
• 'Pay' means to give money for goods or services.
• 'Prolong' means to extend the duration of.
• 'Pollute' means to contaminate.
• Therefore, 'Inadequate' is the correct synonym.