Final answer:
Janet's declining grades in math and science may be a result of peer pressure and lack of motivation. The influence of her liking for a boy in class who struggles in these subjects and the prioritization of relationships over academic performance may be contributing factors. Option a) is correct.
Step-by-step explanation:
The decline in Janet's grades in math and science may be related to peer pressure and social identity. Janet's liking for a boy in class who struggles in these subjects may be influencing her to prioritize her relationships over her academic performance. The fear of being viewed differently by her peers may be pushing her to conform to their norms, which may not prioritize academic success.
Additionally, a possible reason for her declining grades could be lack of motivation. Janet may have lost her enthusiasm for math and science because she is more focused on her relationship with this boy and does not find the subjects interesting or engaging on their own.
While the other options of teacher bias and lack of parental support could potentially be factors, based on the information provided, peer pressure and lack of motivation seem to be more directly related to Janet's declining grades in math and science.