After reading 7-8-5 of the .65 it says altitude assignment for VFR aircraft (class C airspace) should be assigned altitudes that meet MSA OR MVA OR MIA. Is it the lower or higher of the 3? All ensure obstruction clearance.

In the case of a prescribed MIA or MVA, the altitude is easy to determine with the use of charts. However, VFR aircraft departing to a general direction of flight will probably not be on an ATS route which has the prescribed altitudes, therefore we will be using the MSA or the MIA (2000 feet above highest obstacle in mountainous area, 1000 in non-mountainous)...how does ATC assign VFR altitudes that are hard to determine? Are we able to utilize the MEF's and add 1000/500 feet? Or even better, use MVA's?

I believe a pilot can accept a decent below the MSA. (I.E a decent to join the glideslope)...where in the FARs does it say an aircraft can operate below the MSA?I think a pilot must have the field in sight, although I'm not sure. Thanks.