Materials scientist Marie-Agathe Charpagne and her colleagues believed they could improve on the multi-component alloy NiCoCr, an equal-proportions mixture of nickel (Ni), cobalt (Co), and chromium (Cr), by replacing chromium with ruthenium ________ the alloy that resulted, NiCoRu, turned out to be an unsuitable replacement for NiCoCr.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
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