Explanation:

- Option 1: A new mall can be open nearby last month.

- Incorrect. The use of "can be open" does not fit with the past action "last month."

- Option 2: A new mall was opened nearby last month.

- Correct. This sentence correctly uses the past tense “was opened” to indicate a completed action.

- Option 3: Nearby a new mall is opened last month.

- Incorrect. Mixing of past ("last month") with present tense ("is opened") is grammatically incorrect.

- Option 4: A new mall will be opened nearby last month.

- Incorrect. "Will be opened" suggests future action, which conflicts with "last month."

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