Let A={blue,orange,red,yellow,green} and B={silver,orange,blue,gold,yellow}. Which set represents A∪B? Select the correct answer below:
a. {orange,red,yellow,green,silver,gold}
b. {blue,orange,red,yellow,green,silver,black}
c. {blue,orange,red,yellow,green,silver,gold}
d. {blue,orange,red,yellow,green,silver,gold,black}