(A) Billing and Shipping
(D) Sessions with Transactions
You should optimize the Billing and Shipping step in the Checkout process because it has the highest Drop-Off rate. The Drop-Off rate is the percentage of users who abandoned the checkout process at a particular stage. The Billing and Shipping stage has the highest Drop-Off rate(33.79%) which means that around 34 people are abandoning the checkout process at this particular step. Therefore, you need to optimize this step in order to get more conversions.
This question is a part of the Assessment 4 section of the Google Analytics for Power Users course. You can find all the questions from all the four assessments with detailed explanation for this exam in our Google Analytics for Power Users Assessment Answers page.