When caliban refers to trinculo as "this thing" in line 13, the word thing conveys

The contempt he has for Trinculo.

Caliban uses this word in Act III, scene 2. The passage is the following:

I say, by sorcery he got this isle;

From me he got it. If thy greatness will

Revenge it on him, for I know thou darest,

But this thing dare not,

In this scene, Caliban is plotting with Stephano to take the island away from Prospero, and rule it. He refers to Stephano as "thy greatness" and says that he believes he has what it takes to carry it out. However, he thinks little of Trinculo and does not think he would dare commit something like that. The contempt Caliban has for Trinculo is shown in his use of the word "thing."

the correct answer is:

this is an example of the writer telling through description rather than showing through dialogue.

sometimes writers like to explain explicitely what's happening instead of adding dialogues of the situations., which is the case in this passage,

the answer is, a) she is angry with elnora for not standing up for herself.