Read the following statements and select the correct ones.
(i) All the colour components of the visible spectrum are available for marine plants living in different depths of the ocean.
(ii) Many herbs and shrubs in rainforests adapt to photosynthesise optimally under very low light conditions as they grow under canopy trees
(iii) Gradual increase in average global temperature will affect the distributional range of some species.
(iv) The quality of soil does not depend upon the weathering process.

Options

A. (i) and (ii)
B. (ii) and (iv)
C. (ii) and (iii)
D. (i) and (iv)

Explanation

To solve the question, we need to evaluate each of the four statements provided and determine which ones are correct.

### Step-by-Step Solution:

1. **Evaluate Statement (i)**:
- Statement: "All the colour components of the visible spectrum are available for marine plants living in different depths of the ocean."
- Analysis: This statement is **false**. In marine environments, light penetration varies with depth, and different colors of light penetrate to different extents. For example, red light does not penetrate deep waters effectively, leading to light zonation. Therefore, not all color components are available to marine plants at various depths.

2. **Evaluate Statement (ii)**:
- Statement: "Many herbs and shrubs in rainforests adapt to photosynthesize optimally under very low light conditions as they grow under canopy trees."
- Analysis: This statement is **true**. In rainforests, the canopy formed by tall trees blocks sunlight, creating low-light conditions for the understory plants. These plants have adapted to photosynthesize efficiently in such low light, making this statement correct.

3. **Evaluate Statement (iii)**:
- Statement: "Gradual increase in average global temperature will affect the distributional range of some species."
- Analysis: This statement is **true**. Species have specific temperature ranges in which they can survive. A gradual increase in global temperatures can push some species beyond their tolerance limits, affecting their distribution and potentially leading to population declines.

4. **Evaluate Statement (iv)**:
- Statement: "The quality of soil does not depend upon the weathering process."
- Analysis: This statement is **false**. The quality of soil is significantly influenced by the weathering process of parent rocks, which affects soil composition, texture, and other properties. Therefore, this statement is incorrect.

### Conclusion:
The correct statements are (ii) and (iii). Thus, the answer is option C.