Which of the following is a possible enol form of 2-butanone? 
Definitions:
Hydrogen Fuel
A clean energy source that produces only water when burned, used in fuel cells or internal combustion engines.
Recycling Technologies
The range of techniques and processes used to collect, process, and repurpose waste materials into new products, reducing the need for raw materials.
Germany
A country in Central Europe known for its rich history, cultural heritage, and as a leading EU and global economy.
Trickle-down Theory
An economic theory that advocates reducing taxes on businesses and the wealthy in society as a means to stimulate business investment and benefit all members of society.
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