Which of the Following Statements Concerning the SI System Is/are $^{\circ}$

Which of the following statements concerning the SI system is/are correct?
1) Prefixes are used to indicate a power of ten multiplier for a given SI base unit of measurement.
2) Degrees Celsius ( $^{\circ}$ C) is the SI base unit for temperature.
3) The kilogram (kg) is the SI base unit for mass.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 3
E) 1,2,and 3