The correct answer is B.
The novel was written in past tense, and the radio broadcast was presented in present tense.
The correct answer is a.
The phrase considered worthy of debate is a participial phrase modifying. Issues; the phrase health insurance and the environment is the object of <span>include.</span>
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.