The answer is A
Reasoning;
a1 = first term;
an= an-1 + d
In a sequence you add the first term (a1) with the second term in a repeating linear equation. In this one you need to add 4 to each term so, the equation is;
a1 = 2
an = an -1 + 4
creating:
2 6 10 14 18 22 26...
