Never done wind power, but this is talking about tests in general. The test writer just didn't proofread enough. Because the answer key is wrong across the board, the test graders would mark all the correct answers incorrect. It would be the same as if the question was thrown out. It is more simple for free response, because a wrong answer like the one you posted would be almost impossible to get. It's a bit more annoying with multiple choice errors, but generally the top scorers mark the correct answers (because they studied) and get them wrong, while the people who didn't prepare as much might guess them right. The final results won't be significantly affected. I've seen this happen on anatomy tests, where obvious answers were marked incorrect, both on multiple choice and free response. However, the points lost were so small, I highly doubt my ranking changed.
2017 Nationals: Experimental Design (1st), Microbe Mission (6th)
Liberal Arts and Science Academy '18