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Looking at updated 2020 NETA Membership application, it is showing 4 Loops for Sportsman C class. Correct me if I'm wrong, but didn't the Alignment of "Sportsman" C, B & A classes essentially take over the names of Rookie C, Novice B & Sportsman A? If so, then I believe that Sportsman C (which renamed old Rookie C class) should be 3 Loops. I remember the vote to align Senior C from 4 Loops to 3 Loops Failed.
Thanks and sorry for the slow reply, but I wanted to be sure before posting. I checked with the rules committee and you're right Sportsman C should ride 3 loops. The 2020 Membership Application has been updated.