The ocala demands were a series of reforms eventually transformed into the platform of the a. populist party b. socialist party c. progressive party d. democratic party

The answer is the Populist Party which is most closely associated with William Jennings Bryan. 

the Socialist Party was mainly noted for  the connection with labor and Eugene V. Debs.

The Progressive Party came into being after Roosevelt's defeat in 1912. The So Called Bullmoose party came into decline in 1918.

The Democratic Party is not noted for its participation Ocala demands.

To be honest i thinks its between the first answer and the third answer