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Reason: Premise:Young kangaroo's forelimb developed--> crawled into mother's pouch for FURTHER development. Premise:Marsupital lion's forelimb developed. Conclusion: They must have climed to mother's pouch. This will be true only if it had not its hind limb developed. Coice (D) addresses this. If we prephase this choice, if the lion's hind limb were developed it couldnt have climbed to mother's pouch. This asserts that young lion's hindlimb was not developed. This is the assumption required for the young lion to climb to mother's pouch. If we negate this option: "Newborn marsupial lions that crawled into their mothers’ pouches could also have done so had they not had only their forelimbs developed at birth." - they could have climbed even if hind limb developed.
then hypothesis that newborn marsupial lions must also have needed to climb into their mothers’ pouches.-would have been weakened , becasue if hindlibs were developed they did not NEED to to that as they do not need any FURTHER DEVELOPMENT as was the case with the young kangaroo.