In which of the following process is the qualified sellers list developed?

Thanks for the invitation, Muhammad.

Answer obiviously is D - Select Sellers.

Select Sellers ( which is one of the output of the conduct procurement process ) is the process where sellers list is developed.

The process of pre approved or prequalified list of prospective seller are developed for contractual services. When you have diffficulty in assessing the quality, standards and services the seller can provide. 

Generally it depends on the demand and organization types. We can't precisely conclude on your options. Generally 1) RFP

Option-A Plan Purchase And Acquisition