Thanks to bamsphd, used their link to find this info on healthcare.gov
Can I drop COBRA and get Marketplace coverage instead and qualify for lower costs based on my income?
Yes. You can drop your COBRA coverage and get a plan in the Health Insurance Marketplace during the open enrollment period. Coverage can begin as early as January 1, 2014. Open enrollment ends March 31, 2014.
When you apply for a Marketplace plan, you may qualify for lower costs on monthly premiums or out-of-pocket costs. This will depend on your household size and income. With the same application you’ll also find out whether you qualify for Medicaid and the Children’s Health Insurance Program (CHIP).
It’s important not to let your COBRA coverage end before your Marketplace plan begins. Otherwise there will be a gap in your coverage
Don't know why they even ask the question since you can drop COBRA for an exchange plan.