阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。
A study has showed that the brain makes decisions about 10 seconds before a person realizes it.
Experts involved in the study said that looking at brain activity while making a decision, they could predict the choices the subjects would make, before they realized that they had made a decision. Lead researcher John-Dylan Haynes, a neuroscientist (神经学家)at the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig, said that the new findings called into questions for “consciousness”of decisions that people make, and might even challenge ideas as to how“free”people are to make a decision at a particular moment.
“We think our decisions are conscious, but these data show that consciousness is just the tip of the iceberg,”Nature magazine quoted (引用) him as saying. Thinking the results“quite dramatic”, Frank Tong of Vanderbilt University in Nashville, Tennessee, said that 10 seconds is“a lifetime”in terms of brain activity.
