A、About every five minutes. B、about every six minutes. C、About every seven minutes. D、About every eight minutes. B

M: Uh, where am I?
W: Excuse me. Do you need any help?
M: Nab, I...I’m just looking...well...Uh, well, actually...yeah. UM...I want to go to the science museum, but I’ve been lost for the past few hours, and I can’t make heads or tails of these ticket machines.
W: Ah, well, just press this button. And from here, it’s a dollar fifty.
M: Okay.
W: Then, get on the train at platform No. 4.
M: Alright. Oh, how often do the trains come around this time of day?
W: Usually, they come about every six minutes.
M: Okay, And where do I get off the train?
W: Get off at State Street Station, three stops from here.
M: Okay, I’ve got it. Thanks for your help.
W: No problem.  Good luck.