I believe the answer is 67 + 23 divided by 4 which is 0
The two mistakes in the sentence are "trophys" and "metals".
The plural form of "trophy" is "trophies" not "trophys" because the plural form of nouns that end in "-y" is usually "-ies".
In the sentence, "metals" is not wrongly spelled but it does not make much sense. It is quite strange to say to someone not to touch trophies and metals, the two objects do not seem to have any type of relationship. If you consider that the person is talking about awards and prizes, instead of metals, he or she is referring to "medals".
Even though there are two more mistakes, I don't think the question aims at those. Just remember that the sentence should start with a capital letter and finish with a full stop.
So the sentence would read: Do not touch trophies or medals.
The answer is indirectly through dialogue
Kara: ''Why would you kick me like that''.
Kiara: ''Because I want to''.
Kara:''why!?''
Kiara:''Be quiet !!!!!!!!''
Kara: ''Im telling the teacher''.
D, as extrinsic means external stimulus. Andrew may not necessarily enjoy doing extra math problems, but there is an incentive, which is good grades. With the other 3 people, there is no incentive other than enjoyment.