The ans is C.
S1:Kernel Level threads can be scheduled separately so it is true.
S2:Context Overhead of switching kernel level threads is more as compared to that of user level threads so it is false.
S3:Blocking kernel level threads does not stop the entire process but blocking user level thread blocks the netire process as the opertating system considers all the threads as one process .. so it is an advantage . So it is also true.
S4:As all threads are treated differently they can be run on diiferent processors unlike user level threads. So it is also true.
