What Does the Bond Buyer Placement Ratio Represent

What does the bond buyer placement ratio represent?

A) the amount of municipal bonds held by banks and insurance companies as a percentage of municipal bonds outstanding
B) the amount of municipal bonds distributed weekly as a percentage of each week's new issue accounts of more than $1 million
C) the amount of municipal bonds offered in the daily Blue List as a percentage of the day's new issue amounts of more than $1 million
D) the par value amount of municipal bonds offered in the Blue List as a percentage of the 30-day visible supply for competitive and negotiated issues