E) Time control
F) Body eating in regular times
G) Happiness of together
H) Eating hot from cooked. Only when losing this and refinding it, people can discover its importance.
A/C) Supervise/Regulation of food and quantity
D) Administer some "good stuff" (vegetable or stuff for growth)
B) Conduct.
Teach how to eat in your plate. Take the food. Warn about dirtying stains. Help them learn how to speak during dinners (for later life). Dont eat too fast. How to use stuff (chopsticks/toothpick). How to cut/share like pizza. How to ask others to pass a plate if its bad to take it or too far away. Position of sitting, not (I) but at least not head first in food.
E+) Time control, as the body will feel sleepy after eating.
C+) Supervise. Its possible to choke on food and die. Just like not supervising a child for 2min in bathtub could kill.
And there are still "mochi suffocation" deaths in jp. "Daily lives of highschool boys" mochi choking is in fact not a joke.