Which number on the map indicates the farthest reaches of alexander conquests?

I took this test and I'll tell you the answers not B. but I cant lay my finger on which on it is

most of the knowledge we have of the conflict comes from roman-jewish scholar titus flavius josephus, who first fought in the revolt against the romans, but was then kept by future emperor vespasian as a slave and interpreter.

the answer is "by providing data about careers and annual mean wages"