Which set of elements form electron precise hydrides?

• A

  $\mathrm{B}, \mathrm{Al}, \mathrm{Ga}$
• Correct answer
  B

  $\mathrm{C}, \mathrm{Si}, \mathrm{Ge}$
• C

  $\mathrm{N}, \mathrm{P}, \mathrm{As}$
• D

  $\mathrm{B}, \mathrm{C}, \mathrm{N}$

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