Based on the options provided, the inference that can be made about Malala's mother would likely align with option c: "She thought that Malala would be safer if she wasn't walking to school." This implies that Malala's mother had concerns about her safety related to the act of walking to school, suggesting that she was aware of the potential dangers.
Options a and d suggest a lack of concern for Malala's safety, while option b implies a misunderstanding of the Taliban's actions based on gender, which is less supported without specific context indicating her beliefs on this matter.