The correct answer is: Only assumption II is implicit.
The statement says that the management of XYZ Pvt. Ltd. asked the workers’ union to call off strike immediately otherwise the management would be forced to close down the factory. This means that the management is not happy with the strike and wants it to end. They are also willing to take the drastic step of closing down the factory if the strike does not end.
Assumption I is that no alternative other than closing down the factory is left for the management of XYZ Pvt. Ltd. This assumption is not implicit in the statement. The statement only says that the management is willing to close down the factory if the strike does not end. It does not say that there are no other alternatives available to the management.
Assumption II is that such threat may have some effect on the workers’ union. This assumption is implicit in the statement. The management is threatening to close down the factory in order to get the workers’ union to call off the strike. This means that the management believes that this threat will have some effect on the workers’ union.
Therefore, only assumption II is implicit in the statement.