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 of the given options cannot be considered an evolutionary trend in human evolution, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Evolutionary Trends**:
- Evolutionary trends refer to the gradual changes in physical characteristics or behaviors of a species over time due to natural selection and adaptation.

2. **Option A: Development of Chin**:
- The development of the chin is indeed an evolutionary trend. Early human ancestors did not have a prominent chin, and over time, as human facial structure evolved, the chin became more pronounced.
- **Conclusion**: This option is part of the evolutionary trend.

3. **Option B: Erect Posture by Development of Lumbar Curve**:
- The development of an erect posture is another evolutionary trend. Early ancestors walked on all fours, and as they evolved, they developed a lumbar curve that allowed for upright walking.
- **Conclusion**: This option is also part of the evolutionary trend.

4. **Option C: Narrowing of Iliac Bones of Pelvic Girdle**:
- This option states that the iliac bones of the pelvic girdle are narrowing. However, in human evolution, the iliac bones have actually broadened and expanded to create a basin-like structure that supports internal organs and aids in bipedal locomotion.
- **Conclusion**: This option does not follow the evolutionary trend, as it incorrectly describes the change in the pelvic girdle.

5. **Option D: Increase in Skull Capacity**:
- The increase in skull capacity is a well-documented evolutionary trend. Over time, human skulls have increased in size to accommodate larger brains, with modern humans having a cranial capacity ranging from 1,315 cc to 2,000 cc.
- **Conclusion**: This option is part of the evolutionary trend.

### Final Answer:
The option that cannot be considered an evolutionary trend in human evolution is **C: Narrowing of Iliac Bones of Pelvic Girdle**.

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