The idiom "Open a can of worms" refers to initiating a situation or uncovering something that is likely to cause significant problems, trouble, and complications.
Option 2, "To spark a situation that creates problems and complications", is the correct meaning. It accurately reflects the act of initiating a complex and troublesome issue that is difficult to resolve.
The other options are not appropriate:
The core idea of the idiom is to bring forth a complex situation full of difficulties.
The sentences given with blanks are to be filled with an appropriate word(s). Four alternatives are suggested for each question. For each question, choose the correct alternative and click the button corresponding to it.
Food was packed, and they__________, a merry, delighted party.
In each of the questions, four alternatives are given for the Idiom/Phrase. Choose the alternative which best expresses the meaning of the Idiom/Phrase and click the button corresponding to it.
pull a fast one