Answer:
200 shares
Step-by-step explanation:
As per the family attribution rule Rule 318 the person is owner of his or her shares and deemed owner of the shares that their parent posseses. This means that Maria is treated as an owner of 100 shares she actually owns and the 100 shares that her mother owns, totalling it to 200 shares. The number of shares that her sister or grandmother owns is not included in the ownership as it is not as per the family attribution rule.