What first helped popularize Santa as a cheerful fellow who slips up and down chimneys?

A Germanic myth
B A poem
C A Woolworth’s radio ad

The origins of Santa Claus can be traced back hundreds of years, but ‘A Visit From Saint Nicholas,’ believed to have been written by Clement Clarke Moore in 1823, gave us the modern image we know so well. The poem described St. Nick as a ‘right jolly old elf’—and that visual has stuck.

The correct answer is A poem.