It refers to the tonic sylable (silaba tónica)
sol (sun) Its a word "aguda"
ra-tón (mouse) Its a word "llana" or "grave"
Mé-xi-co Its a word "esdrújula"
cán-ta-me-lo (sing it to me) its a word "sobredrújula"
Hope this helps u :)
D) México => Eating 12 grapes.
B) Uruguay => Pouring water.
C) Dominican Republic => Wearing old and new clothes.
A) Colombia => Family dinner.