What It The Moaning Of The Idiom/proverb “To Be At Loggerheads” ?

What it the moaning of the Idiom/proverb “To be at loggerheads” ?

A. To cooperate with enemies
B. To be in strong disagreement or dispute
C. To face stiff opposition
D. To tax one’s mind and body

A. To cooperate with enemies
B. To be in strong disagreement or dispute
C. To face stiff opposition
D. To tax one’s mind and body