The inference that can be made from the text "R.M.S. Titanic" is this: The crew did not properly inform all the passengers when the collision took place.
A sentence from the text that best supports the answer to Part A is this; "But the passengers—most of them—did not know that the Titanic, was sinking."
What is the inference?
We can infer from the passage that the operators of the sinking Titanic did not make a proper announcement on time that would alert the passengers to the looming danger. The people were taken unawares because they were not properly informed about the impending disaster.
Another fact about the disaster is that it exposed the limitations of the rigid social structure on the Titanic, leading to uneven access to lifeboats and resources.