Answer:
b. s,p,d
Step-by-step explanation:
The type of orbitals found in the principal energy level n=3 is s, p and d orbitals.
Principal quantum number(n) denotes the energy level in which an orbital is located.
The principal quantum numbers takes values from n = 1, 2,3,4............
For example, the orbitals found in the principal quantum number with a value of 1 is s.
For n = 2, we have s and p
For n = 3, it is given as s, p and d
For n = 4, we have s, p, d and f