the acid hbr is called\na bromous acid\nb hydrogen bromide\nc bromic acid\nd hydrobromic acid

Brief Explanations:

Binary acids are named with the prefix "hydro -" and the anion name has its ending changed to "-ic acid". Bromide ($Br^-$) forms an acid named hydrobromic acid when combined with hydrogen ($H^+$). Bromous acid is $HBrO$, bromic acid is $HBrO_3$, and hydrogen bromide is the gaseous, non - aqueous form of the compound.

Answer:

D. hydrobromic acid