Comma Quiz

Multiple Choice Comma Placement Quiz

This is an interpretive quiz. Tell me how you notice the comma placement changing the meaning of the following sentences:

a) As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals, in some cases, radioactive material, and substances resulting from the presence of animals or from human activity.

b) As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals, and, in some cases, radioactive material, and substances resulting from the presence of animals or from human activity.

c) As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals and, in some cases, radioactive material, and substances resulting from the presence of animals or from human activity.

d) As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals and, in some cases, radioactive material and substances resulting from the presence of animals or from human activity.

I'll post the sentence I chose for these annual water quality reports in comments.