8. The incorrectly punctuated sentence is B.
"Ice hockey is played on rink; but field hockey is played outdoors" is incorrect. The correct punctuation should use a comma instead of a semicolon between rink and but. Therefore, the sentence should read, "Ice hockey is played on rink, but field hockey is played outdoors. A semicolon is not needed because of the use of the conjunction but.
9. The incorrectly punctuated sentence is C.
"The highway goes through cities; farmlands; and prairies." is incorrect. The correct punctuation would use commas to separate the items in the list rather than semicolons. Therefore, the sentence should read, "The highway goes through cities, farmlands, and prairies. Some people also omit the last comma and would just write the list as cities, farmlands and prairies. This is also correct.
Note, that B is correct. Because the list includes cities and states which are separated by commas, it is okay to use the semicolon after each state in the list to clearly separate them in this case. However, commas are used to separate items in lists generally.
