By/ work/ day and night/ they/ succeed/ finish/ project / time//

• A. 
  By the work day and night they succeeded to finish a project on time.
• B. 
  By working day and night they succeeded in finishing the project in time.
• C. 
  By the work day and night they succeeded to finish the project in time.
• D. 
  By working day and night they succeeded finishing their project on time.