Based on the findings of Spelke and her colleagues, under which of the following conditions are 4-month-old infants most likely to conclude that the occluded rod is a single continuous object rather than two objects? a.A block, partly hiding a rod, moves up and down. b.A long rod, partly hidden by a block, moves up and down. c.A bar moves out in front of a sphere it had partially blocked. d. A rod is partly hidden by a block, and both remain stationary.

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