The statement that correctly explains what happens when the president issues a pocket veto is:
"Congress will adjourn within 10 days of the president receiving the bill. If the president does not sign the bill, the bill does not become a law because Congress will not have an opportunity to override the veto."
In a pocket veto, if the president does not sign the bill and Congress adjourns within that 10-day period, the bill fails to become law without an official veto, and Congress cannot override it.