The correct options are:

(A) Arsenic and (D) Phosphorous

These are both -type dopants for silicon because they have five valence electrons (group  elements), which provide extra electrons to the silicon lattice, making it an n-type semiconductor.

while, Boron and Gallium are p-type dopants because they have only three valence electrons, creating holes in the silicon lattice.

Alternate Solution:

Arsenic (As) and Phosphorous (P) are Group 15 elements, they have an extra electrons (5 electrons in valence shell) to contribute to lattice when doped in silicon.

 n-type means material has more electrons than holes,

n-type dopants are (a) and (d)