Sentence Correction (SC) | Scientists have recently discovered what could be the largest and olde

I got it wrong. After reading different explanations here I'm confused now.

How come spawned by______ is a modifier??
agiant fungus(noun) that is an interwoven filigree of mushrooms and rootlike tentacles(modifier of a giant fungus) spawned (verb) by a single fertilized spore some 10,000 years ago-------- past indefinate tense,

OA is A, How is that possible coz it will put a verb and a modfierparallel.