The simplified SOP (Sum of Product) form of the Boolean expression $(P + \overline{Q} + \overline{R}) . (P + \overline{Q} + R) . (P + Q + \overline{R})$ is

Given the Boolean expression in POS form:

Using the distributive law on the first two terms:

Now multiplying this with the third term:

Using the distributive law again:

Thus, the simplified SOP form is $(P + \overline{Q}.\overline{R})$, which corresponds to option (B).