When we refer plural friends where we have to put apostrophe?

[Vara]

English Grammar Tests, Elementary Level

ESL/EFL Test #76 "Anything, nothing, something, everything", question 9

My friend's decisions have ......... to do with me.

(a) nothing
(b) anything
(c) someone
(d) any

English Grammar Tests, Elementary Level

ESL/EFL Test #76 "Anything, nothing, something, everything", answer 9

My friend's decisions have nothing to do with me.

Correct answer: (a) nothing

Your answer was: correct
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It's means "It is" i read

In this example,

Friend's means Friends / Friend is

when we refer plural friends where we have to put apostrophe.. ?

I appreciate your time and effort for making me Learn English...

Vara

[Prezbucky]

In this case, "friend's" is not a contraction. It is the possessive form of "friend".

The phrase "My friend's decisions" literally means "The decisions of my friend".
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Billie Jean is not my lover. Hee.

[Saneta]

My friend's decisions have nothing to do with me.= My friend's decisions have nothing common with me???