Choose the word opposite in meaning to-
JUXTAPOSITION
a) Difference
b) Opposition
c) Separation
d) Appropriateness

Hint: The dictionary meaning of the given word ‘juxtaposition' is ‘the fact of two things being seen or placed close together with a contrasting effect'.

Complete answer:
 The word ‘juxtaposition' is a noun. It is an act of an instance of placing two elements close together or side by side. This is often done in order to compare/contrast the two, show similarities and differences, etc. For example The juxtaposition of these two images.
Now, let us examine all the given options to find out the correct answer :
Option ‘a’ is Difference. It is a noun that means a point or way in which people or things are dissimilar. For example The difference between the two men and women.
Option ‘b’ is Opposition. It is a noun which means resistance or dissent, expressed in action or argument. For example, There was considerable opposition.
Option ‘c’ is Separation. It is a noun that means the action or state of moving or being moved apart. For example, The damage caused by the separation.
Option ‘d’ is Appropriateness. It is a noun that means the quality of being suitable or proper in the circumstances. For example His appropriateness of the practice.
As we have analyzed all the given options, we can easily figure out the correct answer. Here, the word opposite in meaning to ‘juxtaposition’ is ‘separation’. Hence, option ‘c’ is the correct answer.

Note:
All the other options are plausible distractions, one must know the meaning of all the given options. Don’t confuse between ‘difference' and ‘separation’.