In a $k$-way set associative cache, the cache is divided into $v$ sets, each of which consists of $k$ lines. The lines of a set are placed in sequence one after another. The lines in set $s$ are sequenced before the lines in set $(s+1)$. The main memory blocks are numbered $0$ onwards. The main memory block numbered $j$ must be mapped to any one of the cache lines from

In a set-associative cache with $v$ sets, a main memory block $j$ maps to the set given by:

Each set contains $k$ cache lines arranged consecutively. Since the lines in set $s$ come after all lines of sets $0, 1, \dots, s-1$, the starting cache line index for set $s$ is:

Since there are $k$ lines in this set, the range of valid line indices for block $j$ is:

Hence, the correct option is (A).