If assumption I holds, then there is no possibility that Mahesh’s friends would know about his birthday. Therefore, assumption I is not implicit as it does not support the given statement. According to assumption II, Mahesh receives best wishes from his friends on his birthday. This is possible when his friends are aware of his birthday. Thus, assumption II supports the given statement. Therefore, assumption II is implicit. Assumption III does not discuss anything about Mahesh’s friends. Therefore, assumption III does not support the given statement and hence is not implicit. Hence, only assumption II is implicit.