Correct Answer: Impediment

Solution : The correct choice is the second option .

Hurdle refers to a problem that should be solved to move further.

Impediment is a hindrance or obstruction to doing something. Both of these mean a problem, thus making them synonymous.

The meanings of the other options are as follows:

• Progress means to move towards an improved state.
• Accessory is a thing that is added to something to make it more useful or for decorative purposes.
• Aid means to give help.