The following sentence contains a grammatical error. Select

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The following sentence contains a grammatical error. Select the option that correctly rectifies the error.
He sees us coming, and unaware that we had learned of his treachery, greeted us with a smile

[SSC CHSL 1st June 2022 Shift-1 With Answers]

He saw us coming, and unaware that we learned of his treachery, greeted us with a smile.

He saw us coming, and unaware that we had learned of his treachery, greeted us with a smile.

He saw us coming, and unaware that we were learning of his treachery, greeted us with a smile

He saw us come, and unaware that we had learned of his treachery, greets us with a smile.

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