ITP - hashes - exercise - 8

If you see this error, what do you suspect is the most likely problem?

NoMethodError: undefined method `keys' for Array

A. We're missing keys in an array variable.

B. There is no method called keys for Array objects.

C. keys is an Array object, but it hasn't been defined yet.

D. There's an array of strings, and we're trying to get the string keys
out of the array, but it doesn't exist.