Introduction:
The antonym of a word refers to a word that has the opposite meaning. In the case of the word "alienate," which means to cause someone to become indifferent or hostile, the antonym would be a word that signifies bringing people together or establishing a connection.

Explanation:
Let's analyze the given options to determine the antonym of "alienate":

a) Gather:
While gathering implies bringing people or things together, it does not necessarily involve establishing a connection or avoiding alienation. Therefore, "gather" is not the antonym of "alienate."

b) Identify:
Identifying refers to recognizing or distinguishing something or someone. In the context of alienation, identifying does not directly oppose it. However, it can be considered as an option since recognizing someone may help in reducing alienation.

c) Assemble:
Assembling involves gathering or bringing together different components or people to create a whole. Although it shares similarities with gathering, it does not inherently imply reducing alienation. Thus, "assemble" is not the antonym of "alienate."

d) Unite:
The word "unite" means to bring together or join forces. It directly opposes the concept of alienation by emphasizing the establishment of a connection or bond. Therefore, "unite" is the antonym of "alienate."

Conclusion:
Among the given options, the antonym of "alienate" is "unite." While other options may involve gathering or recognizing, only "unite" signifies actively bringing people together and establishing a connection, which counters the concept of alienation.