Leed-certified buildings could be described by all of the following, except efficientlimit pollution and recycle wastesreduce the ecological footprint of the buildingbuilt with sustainable materialsconstruction costs much less than for conventional buildings

The answer is: construction costs much less than for conventional buildings

Explanation:

Leadership in Energy and Environmental Design (LEED), is an international certification program that focuses on new "green" commercial buildings projects and is based upon a points system. It rates buildings on energy savings, water efficiency, CO2 emissions reduction, improved indoor environmental quality, etc.

So the more points you earn, the greener your buildings is.

C

Explanation:

Operating leverage may be defined as the potential use of fixed operating costs to magnify the effects of changes in sales on a firm's earnings before interest and taxes