Grape - like, polypoid, bulky mass protruding through vagina in 4 - year old girl is characteristic of: (A) Fibrosarcoma, (B) Leiomyosarcoma, (C) Inflammatory polyp, (D) Sarcoma botryoides
Answer is D. sarcoma botryoides :

It is a variant of embryonal from of rhabdomyosarcoma.
Here tumour project into body cavity like a bunch of grapes.