In a tree, a long growing season would be represented by a:

narrow ring
wide ring
dark ring
light ring

The correct answer is - wide ring.

The width and coloration of the rings depends on the conditions in which the tree grows.

The longer the growing season lasts, the wider the ring would be, and the outlining black ring will be very thin, as it is the one that grows during the colder or less active period of the year.

The shorter the growing season is, the narrower the ring will be, and the black outlining black ring will be bigger because there will be a longer period of the year that is cold or less active.