The word, 'patriot' refers to 'a person who vigorously loves and supports his country and is prepared to defend it against enemies or detractors'. Hence, option C is correct.
The person, 'revolutionary' means 'a person who advocates or engages in political revolution'. The word, 'traitor' means 'a person who betrays someone or something, such as a friend, cause, or principle'. The word, 'ambassador' means 'an accredited diplomat sent by a country as its permanent representative in a foreign country'.
As the meanings of the words, 'revolutionary', 'traitor' and 'ambassador' do not mean 'persons living at the same time', options A, B and D are incorrect.