Millions of people use your invention every day for (they’re) own purposes. Choose the correct revision of the word in parenthesis. * A. their
Bits
C. there
D. it's

this labor, by slow prudence to make mild.   c. ability to govern well

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.