The Kirchhoff's$(\mathrm{\Sigma i}=0)$ first law  and second law $(\mathrm{\Sigma iR}=\mathrm{\Sigma E})$where the symbols have their usual meanings, are respectively based on

• A

  conservation of charge, conservation of momentum

• B

  conservation of energy, conservation of charge

• C

  conservation of momentum, conservation of charge

• D

  conservation of charge, conservation of energy