What seems to be the major difference between a deciduous
forest and a coniferous forest

Differences between coniferous and deciduous forest lie in their names.

Explanation:One of the biggest differences between forests is in their names.Coniferous means 'cone bearing,' and these are trees that have cones, like pine trees.Most conifers are considered evergreens, because they never lose their leaves and are 'forever green,' regardless of the season.Deciduous means 'falling off'. Deciduous trees, on the other hand, lose their leaves each year, which are mainly comprised of trees such as oaks and maple trees.

Result: the difference lies in their name.

You need to give use the answers

The  answer is b since it all happens under ground