I have to take a natural science course to qualify for a 3-credit requirement at TESC.

A lady at Thomas Edison recommended I take the Environment DSST test as the Intro to Computing no longer qualifies as a Natural Science. I am not really into the sciences, and I'm looking for the easiest test available from Dantes or CLEP. I took the Chemistry CLEP years ago, and just barely missed passing by 3 points! Your advice would be very much appreciated!

I was considering:
DSST
Environment and Humanity
Astronomy
Physical Science
Physical Geology

CLEP
is the Biology or Natural Science even worth considering given that I only need 3 credits?