**Core Concept:** Normal labour is characterized by a series of coordinated physiological changes that lead to the expulsion of the fetus from the uterus. Cardinal movements refer to the key events during labour, including uterine contractions, cervical dilation, and descent of the fetus.

**Why the Correct Answer is Right:** The correct answer, D ("uterine contractions, cervical dilation, descent") represents the sequence of events during normal labor. Here, we discuss the primary events in the order they occur:

1. **Uterine Contractions (Correct):** These are rhythmic, involuntary contractions of the uterus caused by the release of oxytocin and prostaglandins. These contractions facilitate the dilation of the cervix and the descent of the fetus.

2. **Cervical Dilation (Correct):** As the uterine contractions occur, the cervix gradually dilates due to the remodeling of collagen fibers and the activation of proteolytic enzymes such as matrix metalloproteinases (MMPs).

3. **Descent of the Fetus (Correct):** This refers to the downward movement of the fetus through the birth canal, facilitated by uterine contractions and cervical dilation.

**Why Each Wrong Option is Incorrect:** Let's examine the incorrect options:

A. This option (A) combines all three events together, but in reality, they occur sequentially.
B. This option (B) mentions uterine contractions and cervical dilation, but it does not address the descent of the fetus.
C. This option (C) only mentions uterine contractions and cervical dilation without addressing the descent of the fetus.

**Clinical Pearl:** Understanding the sequence of events during labor is crucial for delivering a healthy baby. Knowledge of the correct sequence allows healthcare providers to effectively manage and monitor the progression of labor, ensuring a safe and successful delivery.