Non fiction means not real. So A b/c it would make much more sense b/c a spy that came from the cold.
B, because the colon is used to show an example or list of that subject being spoken about
was the mythical king and founder-hero of Athens. Like Perseus, Cadmus, or Heracles, Theseus battled and overcame foes that were identified with an archaic religious and social order: “This was a major cultural transition, like the making of the new Olympia by Hercules” (Ruck & Staples, p. 204)
Answer: but
Explanation:
In 1863, President Abraham Lincoln designated the last Thursday in November as a national holiday of Thanksgiving ....... in 1939, President Franklin Roosevelt decreed that the holiday should always be celebrated on the fourth Thursday of the month.
Out of the options given, the answer is "but". This is the right answer as it'll be used to link both sentences regarding the two activities of the President's together.
The other options such as "for example", "therefore" and "so" when used doesn't make the sentence correct.
