Age determination for a juvenile matters a great deal because it decides whether a person is tried as a child or as an adult, so the law is careful about which kind of evidence it trusts most.
Putting these together, the unreliable, approximate nature of the ossification test rules out Statement I, while the settled preference for documentary proof supports Statement II.
The correct answer is only Statement II is true.
Another way to approach this is to imagine what would happen in practice if each statement, taken on its own, were the operating rule, and check whether that outcome matches how age disputes are actually resolved.
Checking the practical outcome against each combination shows that documents being given precedence, and the ossification test being only an approximate fallback, is the position that actually holds.
Therefore, the correct answer is only Statement II is true.