**Core Concept**
During pregnancy, various physiological and anatomical changes occur in the body. The question is testing the knowledge of the normal physiological and anatomical changes that occur during pregnancy.

**Why the Correct Answer is Right**
The correct answer is related to the changes in the cardiovascular system during pregnancy. Normally, during pregnancy, there is an increase in cardiac output, blood volume, and heart rate. However, this increase is not uniform throughout the body. The blood flow to the kidneys increases, which can lead to a decrease in blood pressure due to decreased peripheral resistance. This is a normal adaptation to ensure adequate blood flow to the fetus.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not related to the normal physiological changes in pregnancy. It is a distractor and does not have a logical connection to the correct answer.

**Option B:** This option is related to the normal physiological changes in pregnancy. However, it is not the correct answer because it is not the least likely to be seen in a normal pregnancy.

**Option C:** This option is not related to the normal physiological changes in pregnancy. It is a distractor and does not have a logical connection to the correct answer.

**Option D:** This option is related to the normal physiological changes in pregnancy. However, it is not the correct answer because it is not the least likely to be seen in a normal pregnancy.

**Clinical Pearl / High-Yield Fact**
The normal physiological changes in pregnancy are an increase in cardiac output, blood volume, and heart rate. The blood flow to the kidneys increases, which can lead to a decrease in blood pressure due to decreased peripheral resistance.

**Correct Answer:** B.