the report/ state/ there/ enough/ oil and gas/ a century/ only if/ present demand/ control//

• A. 
  The report stated that there would be enough oil and gas for a century only if the present demand could be controlled.
• B. 
  The report stated that there would be oil and gas enough for a century only if the present demand could be controlled.
• C. 
  The report stated that there were enough oil and. gas for a century only if the present demand could controlled.
• D. 
  The report stated that there will be enough oil and gas for the century only if the present demand can be controlled.