The space program's missions to Mars have confirmed that the soil composition on that planet is similar to that on our planet.
a. to that on our planet
b. to our planet
c. with the soil on our planet
d. to this composition on our planet
e. to our planet's soil's composition
peterson sc
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Just a general question about this one - would it be correct if it were to say "that of our own planet"? Is "that on" correct? I have trouble distinguishing what's the proper rule re: "that of" and can't really find much online.