Answer:
share ideas for solving the plastic trash problem
If you asked your friend to hand you a book and he handed you a pencil instead, it is phonology as a language system that is most likely broken down. Phonology deals with systems of sounds which includes phonetics in a specific language.
The answer would be the first choice.
As difficult as learning quantum math
As difficult as running five miles in one minute
As difficult as learning three languages
As difficult as catching a greased pig
I personally think that the answer would be C