Selecting relevant keywords, improved landing page, quality and Quality Score are all factors that can lead to a successful PPC advertisement.

1. Selecting Relevant keywords: Choosing the right keywords for your ad campaign is crucial for targeting the right audience. Relevant keywords will help your ad to be more visible to potential customers who are searching for what you're offering.

2. Improved landing page quality: A well-designed landing page that is relevant to the ad and provides a good user experience can increase the chances of conversions.

3. Quality Score: Quality Score is a metric used by search engines that evaluates the relevance and usefulness of your ad and landing page. A high-quality score can result in lower costs and better ad placement.

All of these factors are important and working together can help to improve the performance of your PPC ads and increase the chances of success.