Marketing led (light-emitting diode) lightbulbs, such as the cree led bulb, have been available for only a few years in low lighting levels (lumens). they are designed to replace incandescent and compact fluorescent lightbulbs, in part because of a federal law that phases out incandescent lightbulbs in favor of more energy-efficient ones. led bulbs are more expensive but will last up to 20 years. in what stage of the product life cycle is this product?

The correct answer is "Introduction".

Explanation:

For every product there are 5 steps in the process called The Product Life Cycle which are Development, Introduction, Growth, Maturity and Decline. The product in the example is in it's introduction stage because of these reasons:

I hope this answer helps.          

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds