**Core Concept**
The question tests the understanding of positive signs of pregnancy, which are definitive indicators of pregnancy confirmed by a healthcare provider. Positive signs of pregnancy include fetal heartbeat, fetal movement felt by the examiner, and ultrasonographic evidence of fetal movement.

**Why the Correct Answer is Right**
Given the options are missing, let's discuss the general concept. Positive signs of pregnancy are those that are unequivocal and confirm the presence of a pregnancy. These signs are crucial for diagnosing and managing pregnancy.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, we cannot determine why it is incorrect.
**Option B:** Similarly, without the specific option, we cannot assess its accuracy.
**Option C:** And **Option D:** are also unknown, making it impossible to evaluate their correctness.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that positive signs of pregnancy are essential for confirming pregnancy, especially in the early stages. Fetal heartbeat detection and ultrasonography are critical tools in this process.

**Correct Answer:** Correct Answer: D.