The correct name of below diagram is:

$(a)\;1-Bromo-2-chloro-6-fluoro-4-iodobenzene \\(b)\;1-Bromo-6-chloro-2-fluoro-4-iodobenzene\\(c)\;2-Bromo-1-chloro-3-fluoro-5-iodobenzene \\(d)\;2-Bromo-3-chloro-1-fluoro-5-iodobenzene$

Alphabetically,
Broma > Chloro > Fluoro > Iodo
$1+2+3+5=11$
So, $2-Bromo-3-chloro-1-fluoro-5-iodobenzene$ is correct
Hence d is the correct answer.