Select the option in which the numbers are related in the same way as are the numbers of the following set.
(11, 57, 8)

The logic here is

$$\left(11+8\right)\times3=19\times3=57$$ $$\longrightarrow\ $$ $$\left(\text{first number}+\text{third number}\right)\times3=\text{second number}$$

Similarly,

$$\left(15+12\right)\times3=27\times3=81$$ $$\longrightarrow\ $$ $$\left(\text{first number}+\text{third number}\right)\times3=\text{second number}$$

$$\therefore\ $$(15, 81, 12) is related in the same way (11, 57, 8) are related.

Hence, the correct answer is Option A