Ans (D) is right because
p+ [3 – 5]∗ [xyz]
means all string should start with p and end by x,y or z if this condition is not satisfied then rule out that options-
I. P443y = VALID
I. P6y = NOT VALID BCOZ 6 NOT PRESENT IN THE EXPRESSION
III.3xyz =NOT VALID BCOZ NOT START WITH 'P'
IV. P35z = VALID
V. P353535X =VALID
VI. PPP5= NOT VALID BCOZ STRING START WITH 'P' BUT NOT END WITH X,Y,OR Z