A supporter of the evolutionary theory set forth by Lamarck would probably theorize that the giraffe evolved a long neck due to?

A supporter of Lamarck's evolutionary theory would theorize that giraffes evolved long necks because their ancestors stretched their necks to reach higher leaves in trees. This acquired trait would then be passed on to their offspring, leading to progressively longer necks over generations. Lamarck's idea emphasized the role of use and disuse of traits in adaptation, suggesting that the giraffes' efforts to reach food influenced their physical evolution.