Looking at the sequence 2, 4, 6, 8, 10, ..., we can see that the first element is 2 and each subsequent element is 2 units more than the previous element.
Knowing that, we can write the equations:
[tex]\begin{gathered} a_1=2 \\ a_n=a_{n-1}+2 \end{gathered}[/tex]
Therefore the correct option is A.
