The total number of persons who read Ganashakti and Anand Bazar Patrika = 200
Number of persons who read Ganashakti in Dighoshpur =121
Number of persons who read Anand Bazar Patrikain Dighoshpur =117
By Principle of inclusion and exclusion,
AnandBazarPatrika $\cup$ Ganashakti = AnandBazarPatrika + Ganashakti - $\mid Ganashakti \cap Anand bazar patrika \mid$
200 = 121 + 117 - x
x = 38
People who read both Ganashakti and Anand bazar patrika = 38
Hence,
Number of persons in Dighoshpur who read only Ganashakti = 121 - 38 = 83
Answer is b) 83