you said it reverse ..
" If we think simple, synchronous circuits have better noise immunity " - This is reverse statement as you said .
This paper says " "Asynchronous circuits seem to be a good candidate to reduce the problems originated by simultaneous switching noise. However, they are also more sensitive than synchronous ones to spurious signal transitions .... " This line means asynchronous circuits are better to handle noise than synchronous circuits
. So option B is not true here.. as question asked Advantage of synchronous sequential circuits over asynchronous one .
@Manojk @kapil and @sh!va please cross check it once ..