The correct answer is B. The students did the experiment in the lab on Wednesday.
All other possible answers keep it in the passive form, only B is active.
Here, according to the chart (you provided by the link), we can see week first typically has the highest attendance
In short, Your Answer would be Option D
Hope this helps!
Answer c seems the most reasonable, but b could work as well
Entire floor if your looking for the exact answer.
