Select the correct combination of mathematical signs to replace 'Y’ sequentially and balance the following equation.

18 Y 2 Y 3 Y 3 Y 9

By Trial and Error method,

Option A

$$18\times2=3-3\div9$$

$$18\times2=3-\frac{1}{3}$$

$$36=3-\frac{1}{3}$$

$$36=\frac{8}{3}$$

Hence Option A is incorrect

Option B

$$18\times2\div3+3=9$$

$$18\times\frac{2}{3}+3=9$$

$$12+3=9$$

$$15=9$$

Hence Option B is incorrect

Option C

$$18\div2\times3=3-9$$

$$9\times3=3-9$$

$$27=-6$$

Hence Option C is incorrect

Option D

$$18\div2\times3=3\times9$$

$$9\times3=3\times9$$

$$27=27$$

Hence, the correct answer is Option D