Doubt from Friction

Is it B

May be I am wrong.
My intuition says that C is correct
Can you tell me what answer is given? @Navneet_2020

I am sure now answer is C

Ok!
Please upload explanation.

Sorry I was having lunch.
So now focus on the lower block the only force that will cause motion of m_2 block is T( upon solving u will get T=20N)
So if F<25 then the whole system will be in rest.

f_2 will start increasing when T>5 or (F-5)>5N
If F-5>5 \implies F>10N

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