* SC problem

[glory]

According to teachings of the Buddhist and Hindu Religions,attaining nirvana is to enter a state of supreme liberation,leaving behind the desires that perpetuate the cycle of death and rebirth.
1. attaining nirvana is to enter
2. to attain nirvana is entering
3. to attain nirvana is
4. to attain nirvana is to enter
5. attaining nirvana is to be entering.

please explain me the right answer.
many thanks

[esledge]

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