The correct answer is
D- 4 watts
In fact, the different prefixes correspond to the following:
kilowatt: [tex] 1 kW = 10^3 W [/tex]
megawatt: [tex] 1 MW=10^6 W [/tex]
gigawatt: [tex] 1 GW=10^9 W [/tex]
Using the list above, we can convert all the options into Watts:
A) [tex] 1 GW=1 \cdot 10^9 W [/tex]
B) [tex] 2 kW=2 \cdot 10^3 W [/tex]
C) [tex] 3 MW=3 \cdot 10^6 W [/tex]
D) [tex] 4 W [/tex]
Therefore, the smallest quantity is D) 4 Watts.
