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tokens: M.C.A. and J.P.W, were supported by NSF and NASA grants AST-1208911 and NNX15AC92G, respectively. M.C.A. acknowledges student observing support from NRAO. N.M. is supported in part by the Beatrice W. Parrent Fellowship in Astronomy at the University of Hawaii. Leiden is supported by the European Union A-ERC grant 291141 CHEMPLAN, by the Netherlands Research School for Astronomy (NOVA), and by grant 614.001.352 from the Netherlands Organization for Scientific Research (NWO). C.F.M. gratefully acknowledges an ESA Research Fellowship. We thank J.M. Alcalá for providing VLT/X-Shooter spectra for deriving stellar parameters, Ilse Cleeves for providing ALMA continuum and integrated line fluxes for Sz 82 (IM Lup), and Scott Barenfeld for providing ALMA continuum fluxes for Upper Sco sources in advance of publication. We also thank Sean Andrews for his extremely useful comments. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.00220.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.