Which of the following italicized words is correctly capitalized?
a. mount mckinley is the tallest mountain in north america.
b. the most beautiful state is hawaii.
c. marsha speaks excellent german.
d. jim must drive to the north to study the northern lights.

The following italicized word that is correctly capitalized is ‘Jim must drive to the North to study the northern lights.’ Because he is referring North as a proper noun and northern lights is an event which doesn’t need capitalization. 

Plagiarism is taking someone else’s work or words and using them as your own without giving credit to whose they really are. As long as you don’t take credit for others work you don’t need to check.

Hope this helps.