Which fraction is equivalent to $\dfrac{3}{5}$?

1. $\dfrac{5}{8}$

2. $\dfrac{6}{10}$

3. $\dfrac{9}{12}$

4. $\dfrac{12}{18}$

Reducing $\dfrac{6}{10}$ to its lowest terms :

$\dfrac{6}{10} = \dfrac{6 \div 2}{10 \div 2} = \dfrac{3}{5}$, which is equivalent to $\dfrac{3}{5}$.

Hence, option 2 is the correct option.