The answer is: B
Explanation
The correct option is B: 3rd generation (mother), 5th generation (father).
This is the definition of sapinda relationship given by Section 3 (f) of the Hindu Marriage Act, 1955. According to this section, two persons are said to be sapindas of each other if they have a common lineal ascendant within the limits of sapinda relationship, which extends as far as the third generation (inclusive) in the line of ascent through the mother, and the fifth (inclusive) in the line of ascent through the father. This means that a person cannot marry anyone who is related to him or her through the same blood up to three generations on the mother's side and five generations on the father's side. This rule is based on the principle of exogamy, which prohibits marriage within the same family or clan. However, the Hindu Marriage Act also allows for exceptions based on custom or usage, if such custom or usage permits a marriage between two sapindas of each other.