Which of the following explains why influeza virus was so deadly worldwide in 1918?

Honestly, there are a lot of reasons of why the 1918 Influenza Pandemic was so deadly, and main research dates back to 2008. 
Trade routes and World War I was the major factor of why the disease spread.
Therefore, I'd like to pick A. infected soldiers returning from the war spreading the virus when they cough, BUT I'm not sure if you want to believe in me.

Ineed more info for this, i don’t quite understand what you’re asking.

Characteristic expected of mineral from lava at earth's surface

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.