Answer:
E). Besides possibly preventing or inhibiting.
Explanation:
As per the question, option E most appropriately revises the underlined phrase as it is both syntactically and semantically appropriate. The other options are either grammatically inappropriate(parallelism error in options A, B, and C(because 'it is singular while 'forms' is plural' that creates a discrepancy) or lexical error(option D conveys an inadequate meaning due to wrong use of 'and' between the two participles). Therefore, option E only conveys the clear, concise, and grammatically appropriate meaning because it appropriately states that 'the health benefits of tea have become a subject to research; besides possible preventing or inhibiting some forms of cancer,....stroke.'