Answer:
When two events X and Y are independent,
Then, P(X ∩ Y) = P(X) × P(Y)
We know that,

Thus, by substituting the value of P(X ∩ Y),

Which is the required condition for independent events.
In first option,
P(A)=0.3, P(B)=0.5, P(A|B)=0.15

⇒ A and B are not independent events
In second option,
P(A)=0.2, P(B)=0.4, P(A|B)=0.2

⇒ A and B are independent events.
In third option,
P(A)=0.6, P(B)=0.2, P(A|B)=0.3

⇒ A and B are not independent events