As 6 boys and 6 girls are sitting in a row. So these 12 persons can sit in 12! Ways

Now group all 6 girls together and treat them as 1.

Now, all girls together can sit in 7! Ways

And girls can sit among self in 6! Ways.

∴ total ways in which all 6 girls sit together = 7! × 6!

∴ P(E) =

Hence,

P(E) = 1/132

As our answer matches only with option (d)

∴ Option (d) is the only correct choice.