d=(1/2)at^2; solve for a.

i got a=d/([1/5])t^2) but i don't see that in any of the possible responses:

a. a= (2d)/t^2
b. a= 2dt^2
c. a= (dt^2)/2
d. a= d/2t^2

What did I do wrong?
& can you please show detailed work?

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