Mary is on her middle school chess team and has a match this afternoon. So far, she is on a winning streak. She won her last five matches using the same strategy. However, she is having trouble...

Mary is on her middle school chess team and has a match this afternoon. So far, she is on a winning streak. She won her last five matches using the same strategy. However, she is having trouble beating her sixth opponent. Her strategy is no longer working, and she needs to come up with a new one but she cannot figure out what that new strategy should be. Mary is suffering from which of the following?

a. confirmation bias

b.  functional fixedness

c. a mental set

d. poor metacognition