An engineer chooses to use bamboo as a building material because it grows

quickly and needs little space to grow. this is an example of apex

This is an example of Green design.

Explanation:

Green design can be described as a method in which any building project is made by minimizing the harmful effects of construction on humans and environment. Green design is a sustainable design which is better for the economy too. In a green design, eco- friendly materials are used for construction works.

In the scenario discussed in the question, an engineer is using bamboo as a building material due to its eco- friendly features. Hence, it is an example of green design.

i think it's letter a.