A, the narrator. This is due to the process of elimination, plus some basic knowledge
B.
The sentence should be:
"Antoine brushed his teeth before he ate his breakfast."
Ummmm okay? What do you need :)
Answer:
The author most likely included this paragraph in 'The Hot Zone' to explain some of the reasons for downplaying the seriousness of the situation. The lines 'When he talked to the Washington Post reporters, he was careful not to discuss the more dramatic aspects of the operation.