Afallacy is a

a.
type of medical breakthrough that is commonly accepted after fda testing
b.
false or mistaken idea often based on illogical or invalid reasoning and facts
c.
pill that does not contain any medicine, used to conduct double-blind studies
d.
medical professional who has been trained to investigate all types of medical fraud

B, a fallacy is a false a idea based on illogical or invalid truth.

I’m going to guess these are the choices: a) recreational skiing developed in the mid-19th century b) it was originally invented as a way of getting from place to place in snowy regions c) downhill skiing is currently the only common form of the sport d) it mostly evolved from snowshoeing- if that’s the cases then the answer would be c) downhill skiing is currently the only common form of the sport