Based on John Chuang's studies, which two of the following would stop a passthought system from working? A drinkfng coffee B having thoughts B C reading D taking medicine D E fingerprints

## Step 1<br />The problem is about John Chuang's studies on the "passthought" system. The "passthought" system is a type of biometric authentication system that uses brain signals to authenticate a person's identity. <br /><br />## Step 2<br />The question asks which two factors would stop the "passthought" system from working. The options provided are: drinking coffee, having thoughts, reading, taking medicine, and fingerprints.<br /><br />## Step 3<br />The "passthought" system relies on brain signals to authenticate a person's identity. Therefore, any factor that interferes with the brain's signals could potentially disrupt the system.<br /><br />## Step 4<br />Drinking coffee and taking medicine can alter brain signals, which could disrupt the "passthought" system. <br /><br />## Step 5<br />Having thoughts and reading are natural processes that occur in the brain, and they do not typically disrupt the "passthought" system.<br /><br />## Step 6<br />Fingerprints are a different type of biometric authentication method and do not directly affect brain signals.