Answer:
C. Majestic
Step-by-step explanation:
The verb "awed" and description of the "snow covered peaks" make it clear through using process of elimination the other three answers wouldn't work.
A. We know that they can see the peaks so their view is not Obscured
B. "Awed" has a positive connotation so Difficult, which has a negative connotation, wouldn't make any sense in this sentence
D. Boring doesn't make sense for the same reason as Difficult
Also let's look at when we substitute "majestic" into the sentence.
"On our hike, we were awed by the majestic view of the snow covered peaks."
It appears that sublime and majestic would be synonymous in this context.
Hope that helps!