Answer:
D) Ominous
Step-by-step explanation:
Omninious is defined as something that is or exhibits an omen. Omen refers to a sign a person believes shows good or bad things could happen in the future. The way the author describes the forest makes us think that it is mysterious. Although it is beautifil and filled with vegetation, the phrase "dense shadows" gives us the sensation that something could easily emerge from there. The use of the words "dark" and "gloomy" make reference to a scary place where people would be frigthened.
We can see that ominious refers then to the belief of the author that something bad could happen in that forest. The same thing happens with the word forbidding, as it describes something dangerous or hostile.