The correct option is B from
The preposition ‘from’ is used to denote origin or where someone/something belongs to. The sentence denotes that even though Susan is living in Hong Kong, she was originally from the Philippines. Thus option B is correct. Whereas, ‘since’ and ‘for’ cannot be used here because ‘since’ is used to either denote a reason or a period. The Philippines is neither of these, therefore, options C and D are incorrect. The preposition ‘on’ is unsuitable in the given context because firstly the statement clearly states that Susan is living in Hong Kong currently, and secondly ‘on’ is used to speak about the contact with a surface and is not used before a city or country. Therefore option A is incorrect.