Sanjeev stayed at work _______ he could complete the pending work.

The correct answer is Option (4) → so that

Complete sentence: Sanjeev stayed at work so that he could complete the pending work. Sanjeev stayed at work for the purpose of completing the pending work, so "so that" joins the two parts.

Option	Meaning and use	Example
(1) in spite of	In spite of shows contrast and is followed by a noun, not a clause. Staying late and completing the work do not contrast.	The match went on in spite of the rain.
(2) meanwhile	Meanwhile is an adverb meaning at the same time. It does not join two clauses or show purpose.	Dinner will be ready soon; meanwhile, set the table.
(3) although	contrast. "Stayed at work although he could complete the work" makes no sense.	Although he was tired, he kept working.
(4) so that (answer)	So that is a conjunction that introduces a purpose: it tells us why something was done.	She woke up early so that she could catch the first bus.