A cell that lacks sulfite reductase but can still oxidize sulfur for energy could be identified by

A) adenosine phosphosulfate reductase coupled with substrate-level phosphorylation.
B) electrons being transferred to cytochrome c prior to shuttling them into the electron transport chain.
C) identifying an alternative quinone, flavoprotein, or cytochrome.
D) quantifying the release of sulfate byproduct.