There appear to be large molecules...

a) scattered evenly throughout space
b) mostly inside dust cloud regions
c) mostly around giant stars
d) in the cores of stars

Have spent a lot of time trying to find an answer for this one and am having a really hard time of it. Any help would be really appreciated.

Thank you!

No truly "giant molecules" have been found in space. This is just media hyperbole designed to increase readership. In reality the largest molecules found are very simple inorganic compounds such as oxides of metals, and extremely simple carbon molecules such as glycine.

And the answer that you need is b). Stars are way too hot to allow molecules to form. While they may be scattered in space we have not detected them and cannot establish that as fact. Dust clouds shelter molecules from ultraviolet light allowing them to form and remain cool and stable enough to become sufficiently abundant for us to detect.

Cheers!.