Correct option is B
Explanation: The correct answer is the first perception of fetal movements by the mother, known as quickening.
Information Booster:
· Usually felt between 18–20 weeks in primigravida.
· Felt earlier (around 16 weeks) in multigravida.
· Indicates fetal activity and viability.
· One of the earliest subjective signs of fetal life.
Additional Knowledge: (a) Labour contractions indicate onset of labour, not quickening. (c) Fetal growth is a continuous process, not quickening. (d) Maternal heart rate changes are unrelated to quickening.