The correct statement about doctorate degrees is:
A doctorate degree can be costly and takes about 3-6 years to attain.
The other statements are not accurate:
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"Only students with a GED can enroll in a doctorate program." is incorrect because a GED is typically considered equivalent to a high school diploma, and students usually need a bachelor's degree to enroll in a doctorate program.
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"A doctorate program starts after a high school degree and lasts 2-3 years." is incorrect, as doctorate programs usually require a bachelor's degree (or sometimes a master's degree) before enrollment and generally take 3-6 years to complete, not 2-3 years.
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"Only students with a bachelor’s degree can enroll in a doctorate program." is mostly correct, as most doctorate programs do require a bachelor's degree, but some may accept students with a master's or equivalent qualifications as well. However, the statement is not as definitive as the first one regarding the cost and duration of the degree.