Answer:
c. happy (I'm assuming that the underlined word is 'joyous.'
Explanation:
The suffix 'ous' = filled with, thus "filled with joy" = happy
The subject would be the noise in the building.
Even though it occurs mid-sentence, it is what the whole sentence is about. The portion of information in front of the comma was just additional information.
Hola como estas
means hello how are you
