Final answer:
The correct answer is confirmation bias.
Step-by-step explanation:
The correct answer is a. confirmation bias. Confirmation bias is the tendency to seek out and accept information that supports or confirms preexisting beliefs while ignoring or dismissing information that challenges those beliefs. In this scenario, Sandra only uses sources that confirm her belief that attending daycare is detrimental to children's development, despite the majority of research indicating the opposite. By doing so, she is exhibiting confirmation bias.