Answer :
D. Franklin D. Roosevelt was the first president to appear on television, and he did it in 1939.
A.) Is wrong because middle initial should be capitalized and president should not be capitalized.
B.) Is wrong because president shouldn't be capitalized.
C.) Is wrong because first president shouldn't be capitalized.
The proper way to write this sentence is as follows;
D. Franklin D. Roosevelt was the first president to appear on television, and he did it in 1939.
Hope this helps. :)