The approach taken was to ensure the best possible layout to avoid too much cost during remodeling and to ensure optimum use of space.
As per your given plan, the remodeling will be done in bedrooms 2,3 and 4, while no change is made to bedroom 1.
Bedroom 2's wall by the corridor is extended to meet that of bedroom 3, and the partition demarcating bedrooms 3 and 4 is removed to have one bigger single room. With this all windows remain at their original positions and no much tearing down of walls is done.
Options A and B are quite similar, only differing in the position of closets in bedroom 3. As seen, Option A has a larger walk-in/storage closet, and B has a smaller one.
N/B
Dimensions used is Feet and Decimal inches.