Explanation:

• The Hispanic Heritage Month honours the history, culture and contributions of American citizens whose ancestors hailed from Spain, Mexico, the Caribbean and Central and South America.
• The event begins in the middle of September, because of the significance 15th September holds in Latin American history — being the Independence Day of Costa Rica, El Salvador, Guatemala, Honduras and Nicaragua from Spain in 1821.
• The annual event is marked every year from 15th September to 15th October.
• Hispanic Americans are currently the largest minority group in the USA, making up a fifth of the total US population. Majority of Hispanics are Mexican origin, followed by Puerto Rican. 

Hence option 2nd is correct.