Antonym-

quiescent

A. Active

B. Dormant

C. Unconcerned

D. Weak

• active..(quiescent is inactive)
• 10 years agoHelpfull: Yes(1) No(0)
• quiescent is a state were a person or any thing is inactive .so opposite of it is activehence option a
  
• 10 years agoHelpfull: Yes(1) No(0)
• a)Active ; Quiescent= inactive
• 10 years agoHelpfull: Yes(0) No(0)