Explanation:

Let’s break this down. Here’s what’s actually happening with each landform:

- Alluvial fans: These are made where rivers slow down as they leave mountains and hit flatter ground. So, they form at mountain foothills (Option 4).

- ‘V’-shaped valleys: Classic river work in the mountainous areas (Option 1). Fast-flowing water carves deep, narrow valleys shaped like a “V.”

- Deltas: Think Nile, Ganges—the mouth of big rivers, just before they meet the coasts (Option 2). Sediment builds up in the wide, flat lower river.

- Oxbow lakes: Formed from meanders in rivers, mostly in the lower reaches where the river meanders a lot (Option 3).

So the correct match is:

A – 4, B – 1, C – 2, D – 3

Here’s how the options stack up:

1. 4 1 2 3

2. 4 2 1 3

3. 3 2 1 4

4. 3 1 2 4