Final answer:
The subjective statement about sending flowers cannot be assigned truth value, but it is historically true that William of Orange was married to Mary, James II's daughter and was in line for the throne of England.
Step-by-step explanation:
The statement 'We all knew that he had been the one to send her flowers, but nobody could figure out his motive' cannot be assigned a true or false value as it is subjective and lacks historical context or factual content. In contrast, specific historical claims can be evaluated for truthfulness, such as 'William of Orange was married to James II's daughter, Mary, and he was also in line for the throne of England.' This statement is true. William of Orange married Mary, daughter of James II of England, and due to this marriage, he was indeed in line for the English throne.