Which was not a main theme of the renaissance? the rising status of the individual. a return to flat, two-dimensional figures. a return to the naturalistic style. the revival of classical styles and idea?

The 5 themes of the Renaissance were Humanism, Virtue, Rationalism, Secularism, and Individualism.
The answer to your question would be "A return to flat two dimensional figures" 

This is because individualism and a little bit of virtue are involved in The rising status of the individual.

And the revival of classic styles and idea was part of humanism deriving from the Greeks 

Opposition of two melodic ideas is the  right answer 

Answer the tuba 4;