Discussion

Explanation:

Eesha lies on Monday, Tuesday and Wednesday whereas Asha lies on Thursday, Friday and Saturday. Other days they will say the truth. We can make the following table :

  Asha Esha
Monday ✔️
Tuesday ✔️
Wednesday ✔️
Thursday ✔️
Friday ✔️
Saturday ✔️
Sunday ✔️

​​​​​​​Asha can say I was lying yesterday only on Thursday and Sunday.

Esha can say I was lying yesterday only on Thursday and Monday.

∴ Both of them can say yesterday I was lying at the same time only on Thursday.

Hence, option (b).

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