Question

scenes in which i had been principal actor came and went, as in a dream when the will slumbers: now with devilish ingenuity and persistence i was working on managas mind; now standing motionless in the forest listening for that sweet, mysterious melody; now staring aghast at old cla - clas wide - open glassy eyes and white hair dabbled in blood; then suddenly, in the cave at riolama, i was fondly watching the slow return of life and colour to rimas still face.
source: green mansions: a romance of the tropical forest
in this sentence, aghast means:
of or relating to or attended by putrefaction
struck with fear, dread, or consternation
required by compulsion or convention
used of unskilled work, especially domestic work

Explanation:

The word "aghast" is used in the context of staring at someone with "wide - open glassy eyes and white hair dabbled in blood". This suggests a reaction of fear or shock. The first option about putrefaction is related to decay, which is not relevant here. The third option about compulsion or convention is not indicated by the context. The fourth option about unskilled work is also out of context. The second option "struck with fear, dread, or consternation" fits the context of a horrified reaction.

Answer:

struck with fear, dread, or consternation