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Headwaters: Are the source of a stream or river. They are located at the furthest point from where the water body empties or merges with another. Some headwaters are springs that come from under the ground. Others are marshy areas fed by mountain snow. A river’s headwaters can be huge, with thousands of small streams that flow together, or just a trickle from a lake or pond.

Youthful River: A river with a steep gradient that has very few tributaries and flows quickly. Its channels erode deeper rather than wider.

Mature River: A river with a gradient that is less steep than those of youthful rivers and flows more slowly than youthful rivers. A mature river is fed by many tributaries and has more discharge than a youthful river. Its channels erode wider rather than deeper.

Mature River: A river with a gradient that is less steep than those of youthful rivers and flows more slowly than youthful rivers. A mature river is fed by many tributaries and has more discharge than a youthful river. Its channels erode wider rather than deeper.

Explanation:

a. i. only is correct.