What is the process for selecting comic storylines for mcu films?

The Wikipedia entry for Avengers: Doomsday states that the film is based on the Marvel Comics superhero team the Avengers. It notes that the movie will feature an ensemble cast, including Robert Downey Jr. playing Doctor Doom, and that it will bring together characters from different universes such as the Wakandans, New Avengers, Fantastic Four, and the X‑Men to face Doom. The article also mentions that two additional Avengers films, The Kang Dynasty and Secret Wars, have been announced as part of the MCU’s Phase Six and the Multiverse Saga. However, the entry does not provide any information about the internal process Marvel uses to decide which comic storylines are adapted into films. Consequently, based on the verified evidence given, the selection process remains unspecified in this source.