**Core Concept**
Quickening is the perception by the mother of the first fetal movements, which is an essential milestone in pregnancy. It is a subjective experience and can vary among individuals, influenced by factors such as parity and fetal activity.

**Why the Correct Answer is Right**
The sensation of quickening typically occurs between 16-20 weeks of gestation in a primigravida (a woman pregnant for the first time). This period is characterized by increased fetal movements, which become more pronounced as the fetus grows and develops. The perception of quickening is often described as a fluttering or bubbling sensation in the abdomen. This phenomenon is attributed to the growth of the fetus and the establishment of its motor patterns, such as sucking, swallowing, and kicking.

**Why Each Wrong Option is Incorrect**
**Option A:** 12-14 weeks is too early for quickening, as most women do not perceive fetal movements during this period, especially if they are primigravidas.
**Option C:** 26 weeks is too late, as by this stage, the fetus's movements would be more pronounced and often reported by the mother as "feeling the baby kick."
**Option D:** 24-28 weeks is also too late, as quickening usually occurs earlier, and most women would have reported this sensation by this stage.

**Clinical Pearl / High-Yield Fact**
The perception of quickening is an essential milestone in pregnancy, and its timing can vary among individuals. However, it is essential to note that the absence of quickening by 20-22 weeks may indicate fetal demise or growth restriction, necessitating prompt medical evaluation.

**✓ Correct Answer: B. 16-20 weeks. This period is typically associated with the sensation of quickening in pregnant women.**