it mAy BE inFErrED From thE pAssAgE thAt jEts oF gAs ______.
A．ArounD sAgittArius A wErE FounD quitE unExpECtEDly
B．ArE Common phEnomEnA surrounDing Enormous BlACk holEs
C．only Flow AwAy From thE CEntErs oF gAlAxiEs
D．ArE thE truE sourCE oF intEnsE EnErgy