In order to tarnish the public image of his opponent, he has got a mendacious story planted in the local newspaper.

Answer: Option A

False : not according with truth or fact; incorrect.
Fabricated : invent (something) in order to deceive.
Imaginary : existing only in the imagination.
Horrible : causing or likely to cause horror; shocking.
Mendacious : not telling the truth; lying.

Synonym of Mendacious is False