Final answer:
Jane can improve her campaign's quality score primarily by optimizing ad content and landing pages, which enhances ad relevance and user experience, contributing to a better click-through rate and overall ad performance. The correct option is c.
Step-by-step explanation:
Jane knows that her campaigns will be more efficient if she improves her quality score. To do this, she should focus on option (c), which is to optimize ad content and landing pages. This means improving the relevance and quality of her ads, as well as ensuring that the landing pages are relevant, user-friendly, and aligned with the ad's message.
By enhancing the user experience and ensuring relevance, Jane can improve her ad's click-through rate (CTR), which is a significant factor in determining the quality score. Techniques like using relevant keywords, creating compelling ad copy, and A/B testing different elements can contribute to better ad performance.
In contrast, simply increasing the budget (a) or decreasing the bid amount (b) might not effectively improve the quality score, and targeting a broader audience (d) could potentially decrease the relevance of her ads to users. Therefore, optimizing her ad content and landing pages is the most direct and effective strategy to improve the quality score. The correct option is c.