【单选题】

According to the passage, the more superbubbles that exist in a galaxy,
A．(A) the longer the star-formation process will take place

B．(B) the greater the amount of interstellar gas in the galaxy
C．(C) the higher the positive feedback rate of star formation in the galaxy
D．(D) the less magnetic activity in that galaxy
E．(E) the more regular the intervals of star formation