Which of These Statements About the Sun Is Incorrect

Which of these statements about the Sun is incorrect ?

A) The Sun radiates 10²⁶ watts of energy constantly into space.
B) The earth receives approximately 1 part per billion of the Sun's energy.
C) The main problem with solar energy is that it is not energetic enough for use.
D) Using solar energy is a problem because of its relatively low concentration.
E) All of these are correct statements.