At what age is mature 20/20 vision achieved?
a. 3 months
b. 6 months
c. 2 years
d. 5 years

A child usually develops 20/20 vision when he/she reaches 6 months of age.

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