A 25 year old married nullipara undergoes laproscopic cystectomy for ovarian cyst which on histopath reveals ovarian serous cisadenocarcinima.What should be the next management -

• A. Hysterectomy and bilaterals alpingoophorectomy
• B. Serial Ca 125 measurement and follow up
• C. Radiotherapy
• D. Unilateral salpinogoophorectomy