The correct answer is A. The requirement is to combine four custom text fields into one formula field and display the result on two lines.

The formula works as follows:

Street__c displays the street on the first line.

BR() inserts a line break. Salesforce documents the BR formula function as inserting a line break in a text string.

City__c & " , " & Planet__c & " " & Galaxy__c displays the remaining location information on the second line. The & operator connects two or more strings in Salesforce formulas.

Why others are incorrect:

Options using field names without __c are not correct for custom fields. Options using __r are relationship references, not direct custom field references. Options without BR() do not satisfy the two-line requirement.

===========