Historian: In fourteenth-century southern Germany, the acute shortage of mature oak timber used for municipal bridge and cathedral construction was historically attributed by chroniclers to the Great Famine and the Black Death, which supposedly decimated the skilled labor force needed to manage and fell old-growth stands. However, recent dendroclimatological analyses of preserved river revetments indicate that between 1310 and 1345, the region experienced unprecedented multi-year periods of severe spring flooding and saturated soils. Oak taproots are uniquely vulnerable to fatal fungal root rot when submerged for extended periods, which halts trunk maturation and induces premature dieback. Therefore, climatically driven tree mortality, rather than a demographic labor collapse, was the primary cause of the structural timber deficit.
Which of the following, if true, most strengthens the historian's argument?
- AHistorical trade manifests indicate that several large municipal construction projects were suspended between 1348 and 1352 specifically because surviving master foresters could not secure enough laborers to transport felled timber.
- BSixteenth-century civic ordinances in southern Germany required that for every mature oak harvested for public infrastructure, foresters plant two saplings of flood-tolerant tree species.
- In neighboring alpine valleys that experienced comparable population losses during the mid-fourteenth century but whose steep terrain prevented prolonged soil saturation, municipal records show that supplies of mature structural oak remained stable.Answer
- DVirtually all European hardwood tree species suffer irreversible vascular deterioration when subjected to even brief instances of seasonal soil waterlogging.
- EDendroclimatological ring-width measurements from ancient river revetments frequently reflect soil chemistry variations rather than regional precipitation trends.