A Problem with the Basic Oparin-Haldane Model for the Origin

Multiple Choice

A problem with the basic Oparin-Haldane model for the origin of life (though not necessarily an unsolvable one) is that ________.

A) it does not explain the origin of chirality
B) the early Earth is now not thought to have had a highly reducing atmosphere
C) monomers have to be chemically activated before they will polymerize
D) purine bases can attach to sugars in many equally probable ways
E) All of the above.