The decimal 0.55 when expressed as a fraction in the simplest form is

1. $\dfrac{5}{11}$

2. $\dfrac{11}{20}$

3. $\dfrac{55}{100}$

4. $\dfrac{11}{50}$

$0.55 = \dfrac{55}{100}$

= $\dfrac{11}{20} \quad$ [Dividing both by 5]

Hence, option 2 is the correct option.