This can be solved as a disjunctive syllogism: an either or question (either X or Y)
And the conclusions that follow are ‘not X, therefore Y’ and ‘not Y, therefore X’.
The conditions given to us are as follows:
The leave policy is either unpopular with the management or unpopular with the workers.
And that if it is unpopular with workers, a new policy should be adopted.
The conclusions are:
(i) Not unpopular with management (in other words, popular with management). Therefore, unpopular with workers.
(ii) Not unpopular with workers (in other words, popular with workers. Hence, unpopular with management).
So we can say that it is definitely true that if it is not unpopular with the management / if it is popular with the management, then it is unpopular with the workers, and hence a new policy should be adopted.
Hence, A is the correct answer.