Why would selling indulgences not have been possible before europe had switched to a money economic?

this isn't a question and if you're going to list things be kind and use commas.

ba geologist finds four sedimentary rock she determines that no geologic events have shifted the layers she labeles them a,b,c,dbfrom top to bottom

lend lease program was passed by congress on march 11, 1941. the president could ship weapons, food, or stuff to any country whose struggle against the axis assisted u.s. defense

the answer would be a).