Which choice provides the best evidence for the answer to the previous question? choose 1 (choice a) a lines 7–9 (“researchers . . mitochondria”)(“researchers report in the journal cell that the phenomenon is likely linked to two enzymes—sirt3 and sirt4—in mitochondria”) (choice b) b lines 13–17 (“by . . cell.”)(“by invigorating the mitochondria, sirt3 and sirt4 extend the life of cells, by preventing flagging mitochondria from developing tiny holes (or pores) in their membranes that allow proteins that trigger apoptosis, or cell death, to seep out into the rest of the cell.”) (choice c) c lines 36–38 (“the . . mitochondria.”)(“the uptick in nad levels activates the sirt3 and sirt4 genes, increasing levels of their corresponding sirt3 and sirt4 enzymes, which then flood the interior of the mitochondria.”) (choice d) d lines 39–42 (“sinclair . . enzymes.”)(“sinclair says he's not sure exactly how sirt3 and sirt4 beef up the mitochondria's energy output, but that events leading to cell death are at the very least delayed when there are vast quantities of the enzymes.”)