Question

Read this sentence from The Evolution of Useful Things.

Making waterproof sandpaper would allow wet sanding, which in turn would cut down on dust, and thus be a great improvement.

The underlined phrases indicate

passing of time.
a directional change of position.
a cause-and-effect relationship.
sequence of events

Answer 1

c - a cause-and-effect relationship

Step-by-step explanation:

i took da unit test and got it right c:

Answer 2

C. a cause and effect relationship