Question

an investigation of the maine sinking was held in 1911 because
eyewitness accounts were available for the first time.
the first investigators did not reach a conclusion.
many people did not trust the first investigation.
that was less than a year after the ship sank.

Explanation:

The sinking of the USS Maine occurred in 1898. The first investigation had conclusions that were disputed, and many people (including those with different perspectives on the incident's cause, like for war propaganda or accurate determination) did not trust the first investigation. Eyewitness accounts would have been available earlier, the first investigators did reach a conclusion (even if disputed), and 1911 is over a decade after 1898, so the correct reason is that many people did not trust the first investigation.

Answer:

C. many people did not trust the first investigation