A(n) records the boundaries of a three-dimensional shape.

A CONTOUR LINE record the boundaries of a three dimensional shape.
In Art, a contour line is a line which defines a form or an edge. It is an outline of a given object. Contour line is usually drawn by following the visible edges of a shape and those edges along the interior of the shape. Contour line is often used to show dramatic changes of planes within an object.

D. All of these

Explanation:

Lake Naivasha has seen a huge rise in pollution due to the integration of the Kenya flower farming industry. This is due to the chemicals and fertilizers used to farm the flowers. Indeed in the year, Researchers estimate that due to a torrential rainfall that hit the area, millions of fish and aquatic life died when fertilizers and chemicals were washed into the lake.

The use of water from the lake for flower farming has also reduced the amount of water available to locals. This as well as the massive increase in the population of area as people come from far and wide to work for the flower farms have also increased the usage of the lake thereby reducing what is left for the locals.

Used in farming are water flowers and their overuse have led to their numbers dropping as well.