Among the following which cannot be considered as evolutionary trend in human evolution?

Options

A. Devlopment on chin
B. Erect posture by the devlopment of lumber curve
C. Norrowing of ilium bones of pelvic girdle
D. Increase in skull capacity

Answer

To determine which option cannot be considered an evolutionary trend in human evolution, we will analyze each option provided:

1. **Development of Chin**:
- The development of the chin is indeed an evolutionary trend. In earlier human ancestors, the chin was absent, and as evolution progressed, the chin became a prominent feature in modern humans. This change reflects adaptations in facial structure over time.

2. **Erect Posture by Development of Lumbar Curve**:
- The development of an erect posture due to the formation of the lumbar curve is also an evolutionary trend. The lumbar curve allows for an upright posture, which is a significant adaptation in human evolution, enabling bipedal locomotion.

3. **Narrowing of Ilium Bones of Pelvic Girdle**:
- This option is the one that cannot be considered an evolutionary trend in human evolution. In fact, the iliac bones of the pelvic girdle have evolved to become broader and more basin-like to support bipedalism and accommodate internal organs. Therefore, the narrowing of the ilium bones is not an observed trend in human evolution.

4. **Increase in Skull Capacity**:
- The increase in skull capacity is indeed an evolutionary trend. Over time, the cranial capacity has increased in humans, allowing for a larger and more complex brain, which is crucial for advanced cognitive functions.

Based on this analysis, the option that cannot be considered an evolutionary trend in human evolution is:

**Answer: Narrowing of ilium bones of pelvic girdle (Option 3)**