To be great is to be misunderstood.” Emerson has used this phrase in the context that if people misunderstand a person due to his different ideas from the masses, then the person is, in fact, a great thinker.
"B. Do you know how to write 100 in
<span> roman numerals?</span>" does not contain any errors in capitalization. "Roman numerals" does not need to be capitalized because they're a form of numbers.