Answer:
Hello!!! Princess Sakura here ^^
Step-by-step explanation:
It is choice a because [tex]a_{1}[/tex] is the [tex]1_{st}[/tex] one in the the sequence so in this case it's 2 which eliminate everything except a, but just in case we will find d. So 2 needed a +3 to get to 5 and 5+3 will give you 8. So now we now that d =3.