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The correct answer is option 1, which matches the landform features with their respective locations as follows:
A. Alluvial fans - 4. Mountain Foothills
B. `V`-shaped valleys - 1. Mountainous Areas
C. Deltas of the river - 2. Coasts
D. Ox-bow lakes - 3. Lower Reaches of the river
This means that alluvial fans are commonly found in mountain foothills, `V`-shaped valleys are typically found in mountainous areas, deltas of the river are located near coasts, and ox-bow lakes are usually found in the lower reaches of a river.
Option 2 is incorrect because it does not match the landform features correctly with their respective locations. Option 3 is also incorrect for the same reason. Option 4 is also incorrect as it does not match the landform features correctly with their respective locations.
Therefore, the correct answer is option 1.