The answer is a. President.
The word President is the predicate nominative here, also known as predicate noun.
A predicate noun is a word which renames the noun that has been mentioned in the sentence. In this case Franklin Roosevelt is the noun that has been renamed as "President", which makes it the answer to the question.
Another example in : My brother's favourite food is pizza.
The predicate nominative in the sentence is Pizza. because that is the word that is replacing the earlier mentioned noun, which was "food".
When you write about yourself
Customs, because it’s a way of doing just like tradition
Tone can be best described as as yelling, screaming, or any kind of noise.
For instence, if I were yelling while watching the Super Bowl, that would be a tone.
Hope my example and answer helps!
