Not sure if you're given actual answer options but from what I can see, I can conclude that the answer should be auditory :) hope this helps!
B. The use of words such as "planetary" and "potential" helps establish a formal style.
Answer:He is relieved to find signs that there is someone nearby.
Explanation:
A
According to the definition of restrictive clauses, it is a clause which hides possible meaning of preceding subject by limiting it.
And with its definition we can easily determine the needed clause in each sentence:
1. <span>The girl with the golden hair is the one we are looking for.
2. </span><span>The dog that ate my homework is called Henry.
</span>3. I’m saving the muffins that have cherries<span> for my sister.
4. The smile that she gave them was beautiful.
As you can see it can pose as characteristic of a subject in some measure.
Do hope it will help you!</span>