A major concern among Bangladeshi archeologists today is the preservation of our archeological sites, ____ are threatened by development.

1. A major concern among Bangladeshi archeologists today is the preservation of our archeological sites, ____ are threatened by development.

[DBBL Probationary Officer-2011 : 2011]

1. of which many

2. many of which

3. many of them

4. which many

5. None of these

Answer

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