A recent study (the columnist's friend!) noted that people are sometimes overwhelmed by choice in the marketplace; apparently, if you show people six jellies, they'll buy one. Show them 60 and they back away whimpering and don't buy jelly at all. To which I say: Wimps. The jelly aisle is a challenge any American should be able to meet. Bring it on, Smucker's. Give me the seedless and the seedful, the preserves, the blackberry currant in an inverted squeezable bottle with a no-drip spout, the Mackingham & Prosley Curried Marmalade ($5.99, imported, by appointment to the Royal Family, very classy,...