What is an example of an unstructured question?

Multiple Choice

"What would convince you to buy this toothpaste $($A$.$ lower price, B$.$ larger packaging, C$.$ better taste$)?"$

"Would you buy this toothpaste $($A$.$ definitely, B$.$ maybe, C$.$ definitely not$)?"$

"Would you buy this toothpaste $($Yes$/$No$)?"$

"Why did you buy this product?"

"Please rate the attributes of this toothpaste that are important to you $($rate $1-5,$ with $1$ being most important and $5$ being least important$)."$