Correct option is A
The highlighted word "decapitated" means to cut off the head of someone, directly synonymous with "beheaded."
Synonyms: beheaded, guillotined, executed, severed.
Antonyms: attached, connected, whole, intact.
Meanings of other given words:
• Dismissed: order or allow to leave; send away, typically used in the context of ending a service or employment.
• Kidnapped: take (someone) away illegally by force, typically to obtain a ransom.
• Discharged: allow (a liquid, gas, or other substance) to flow out from where it has been confined, or the act of releasing someone from a job or duty.
Only "beheaded" directly refers to the act of removing the head, matching "decapitated."