Force... I hope this helped you
A. Sodium is correct.
Sodium is an alkali metal.
Aluminum is a post-transitional metal- still a metal but it’s character is not as metallic as sodium.
Silicon is a metalloid- it has characteristics from both the metals and the non-metals.
Phosphorous is a non-metal.
The molar mass of Beryllium is 9.012182 u (symbol I can't put down) 0.000003 U