Option 3 : 1

**Concept Used- **

If remainder in a/b( when a is divided by b) is r then the remainder when a^{n} is divided by b is r^{n}

**Calculation-**

When 11 is divided by 8 remainder is +3

When 11^{78} is divided by 8 remainder is 3^{78} but if it is greater than 8 it will again be divided by 8 to get the exact remainder.

3^{78}/8

= (3^{2})^{39}/8

= 9^{39}/8

= 1^{39} = 1

**∴ The remainder is 1**

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