Can a Hindu girl marry a Muslim boy?

Answer A

According to Hinduism:
It is strictly prohibited and those from orthodox sects even forbid inter-caste marriages.

According to Islamic marriage rules:
No, A Hindu girl can't marry a Muslim boy. Muslim boy can marry only a Muslim, Jewish, or Christian girl.

However, if the girl or boy is neither Muslim, Christian, or Jewish (and is Hindu or Buddhist or Atheist) then he / she should convert to Islam to be able to marry the Muslim boy or girl. Convert to Islam should be under free will and full choice,

Answer B (Another view):
Love and attraction has no bounds. Those who realize that the God is ONE and all humans are same can marry anyone from any society. Marriage is an understanding between two souls to live together in love.

Laws change country to country and if the law of your country allows you to marry without converting - you can marry and live in harmony.  

Answer C

Per Islam religion, it is forbidden for a Muslim girl to marry non Muslim boy (Hindu, Jewish, Christian, Buddhist,....). Being Muslim means a contract with Allah (God in English) to follow Islam faith per Quran and prophet Muhammad teachings. Fulfilling the terms of contract assures you the God blessings in your life and afterlife. Otherwise, you will be expelled from God mercy and love. Following the terms of contract with God has priority over following the contracts or laws of a country or people