10. Which of these gives the most nominal protection from the sun?
a shirt with no sleeves
b. Sunscreen
C. a hat and an umbrella

there is a sequence and logical steps to give an answer of a trouble.

1) strategy is necessary to develop an project idea.

2) to study and know the environment where you are going to work ( ecosystem).

3)   the materials resources to built the ideas.

4) to give a priority order in the context that you study. in this case human needs.

wrong! the answer is c.