Researchers have tested whether people can learn to use different search strategies by training them. What was the general conclusion based on these research studies?
A. People can learn different search strategies, but it does not improve performance over all or on tasks where a target is present
B. People cannot shift from serial to parallel processing when targets are present
C. People can learn different search strategies and training does improve performance overall
D. People can learn different search strategies but it does not improve performance over all or on tasks where a target is absent
