In polling, which of the following makes it possible for a survey sample to adequately represent a total population?

The current President of Iran, elected in 2013 is __________

a. Hassan Rouhani b. Mir Hossein Mousavi c. Ayatollah Ali Khamenei d. Mahmoud Ahmadinejad e. Reza Shah

The ______ provided more flexibility into the achievement of standards and returned authority to the states.

Fill in the blank(s) with the appropriate word(s).