The execution progress of your project has been found to be too slow. Which measure is most likely to immediately speed up the project?

I agree with Mr. Dahiya ; D

Fourth answer D.

That's the best answer

D  Collocation of team members at a suitable place

The first three are actually loosing the valuable time in the critical situation. I'll go with (D)

 D.  Collocation of team members at a suitable place

Thanks for the invite

  D Collocation of team members at a suitable place

Answers wonderful friends

Yeah as it is an urgent measure may lead to change 

Agree with you all 

Choice (D)

Option D is best Answer

I Useall of the above in addition to the follow-up field with daily reports and reports as well as weekly and monthly

Option  D

   Collocation of team members at a suitable place means setting objectives for each team member. As far as possible, these objective such be SMART - Specific Measurable Achievable Resourced Timed.