Refer to the following number series and answer the question that follows (all numbers are single-digit numbers only). Counting to be done from left to right only.
(Left) 4 7 1 9 0 5 3 8 2 6 1 4 7 9 2 0 3 6 8 5 1 2 7 3 4 (Right)
How many of the numbers are perfect squares?

4 7 1 9 0 5 3 8 2 6 1 4 7 9 2 0 3 6 8 5 1 2 7 3 4

Now let's count only 1, 4, and 9:

Now,

1 → appears at positions: 3, 11, 21 → 3 times

4 → positions: 1, 12, 25 → 3 times

9 → positions: 4, 14 → 2 times

Total = 3 (ones) + 3 (fours) + 2 (nines) = 8

Thus, correct option is (b).