**Core Concept**
The perception of fetal movements, also known as quickening, is a significant milestone in pregnancy. It is essential for the pregnant woman to be aware of the expected time frame for feeling fetal movements to ensure proper fetal monitoring and timely medical intervention if necessary.

**Why the Correct Answer is Right**
Fetal movements are caused by the contraction of the fetus's muscles, particularly the arms and legs. By the end of the first trimester, the fetus's nervous system is sufficiently developed to allow for these movements. Typically, women can feel fetal movements between 16 to 25 weeks of gestation. The exact time frame can vary depending on factors such as the woman's body mass index (BMI), the position of the fetus, and the woman's sensitivity to these movements. Women with a lower BMI or a fetus in a more accessible position may be able to feel fetal movements earlier.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect because it is too early for most women to feel fetal movements.
**Option B:** This option is likely incorrect because it is too late for most women to feel fetal movements for the first time.
**Option C:** This option is likely incorrect because it is too broad and does not provide a specific time frame.

**Clinical Pearl / High-Yield Fact**
Women who are less sensitive to fetal movements, such as those with a higher BMI or a fetus in a less accessible position, may need to rely on other methods, such as ultrasound, to monitor fetal well-being.

**Correct Answer:** B. 18-20 weeks.