Parents who are classified as dismissive display a bias when they encounter infants who are expressing negative emotions. specifically, these parents are likely to.

- All of the above(experience a negative physiological response to negative infant emotion; evaluate an infant s negative emotional expressions as aversive and threatening; experience a fear of being rejected by the infant, a negative emotion stemming from their own attachment history.)

Explanation:

Dismissive or uninvolved parents are described as the ones who are completely neglectful or irresponsible to the needs of their child and fail to provide them even the basic necessities like food, affection, and care. These parents tend to reflect a kind of bias when they witness infants expressing negative emotions as they were quite dismissive to realize that a child requires positive and healthy environment to have a positive social-learning.

These parents would evaluate their negative emotions as threats or aversion due to their own inability to realize the actual reason(which is their dismissive behavior from which the infant learns) for such a negative response. The uninvolved parents may even feel that they could be rejected by the baby as they associate it to their own personal(attachment) history rather than attempting to know the cause of infant's negative behavior. Thus, all of the above are correct in case of a 'dismissive or univolved parents'.