When a composite flight plan indicates VFR for the first portion

When a composite flight plan indicates VFR for the first portion of the flight, what is the procedure for the transition?

A.The VFR portion is automatically canceled and the IFR portion is automatically activated when the pilot reports IFR conditions.

B.The pilot should advise ATC to cancel VFR and activate the IFR portion of the flight.

C.The pilot should close the VFR portion with the nearest FSS and request the IFR clearance at least 5 minutes prior to IFR.

正确答案是C