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Choose the phrase that is closest in meaning to the underlined part. Many of these early systems had advantages that seemed exciting and promising when demonstrated with “toy” programs , but ran into difficulties when attempts were made to extend them to more realistically-sized programs.
A.
showed attractiveness and usefulness for game applications
B.
appeared attractive and hopeful when applied to small test programs
C.
seemed to be excited and promised when used as demos in game applications
D.
showed excitement and promises when executing unrealistic programs