One way to punctuate a compound sentence correctly is to join the two independent clauses with

a comma.
a semicolon.
a comma and a subordinating conjunction.
a semicolon and a coordinating conjunction.

One way to punctuate a compound sentence correctly is to joind the two independent clauses with a semicolon.

A sentence which contains two independent clauses with related ideas is known as a compound sentence.

Semicolons are employed in order to link ideas related closely. Besides, it is used to join two independent clauses.

For example: He said he didn´t mind if I leave the country; it soon became clear he wasn´t beeing honest.

the best and most correct answer among the choices provided by your question is the second choice.

the sentences  articulate the philosophical concept of altruism.

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