I am not sure if the bus that has been booked will be able to ______ all the students.
'sit' is inappropriate as bus is not sitting the students and this is different from saying if the bus will have enough seats for all the students.
'deteriorate' means becoming progressively worse and is clearly unsuitable here.
'fill' is also inappropriate here as the bus is not filling the students but rather students are filling the bus.
'accommodate' means to provide sufficient space and is the apt word here.
Correct Answer: D.
Accommodate is the correct word for this sentence.