Blueberry bushes are planted in a field in the year 2009. the blueberry bushes start to grow and cover the field in such a way that the area covered by the bushes doubles every year. if they continue to grow in this way, the field will be entirely covered with blueberry bushes by the year 2016.

when will the field be covered 25% of the way?

a.
the field will be covered 25% of the way in 2013.
b.
the field will be covered 25% of the way in 2015.
c.
the field will be covered 25% of the way in 2014.
d.
the field will be covered 25% of the way in 2012.
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