Acceptance is a sign of respect for each other.

B acceptance is a very casual action, which will enhance everyone's understanding and trust.

C note: it is polite to pick up chopsticks with both hands.

D say "thank you" by the way when you pick up chopsticks. (especially the elders)

Be natural and don't be formal.

F greeted with a smile.

In fact, eating is a university question, but we all know some common sense, which may need to be discovered with our eyes.