How many among the following imparts colour to the Bunsen flame, when flame test is carried out?
$\mathrm{B}\mathrm{a},\mathrm{}\mathrm{M}\mathrm{g},\mathrm{}\mathrm{C}\mathrm{a},\mathrm{}\mathrm{B}\mathrm{e},\mathrm{}\mathrm{N}\mathrm{a},\mathrm{}\mathrm{S}\mathrm{r},\mathrm{}\mathrm{K}$

• Correct answer
  A

  5
• B

  6
• C

  7
• D

  4

Hence, the correct answer is option: 'A'.