Test by mentor doubt

Question

In https://gateoverflow.in/285452/Go2019-flt1-27 , wouldn’t the query in question return distinct values, while query in option B can duplicate return values? 

Ex: 

A	B	C
a1	4000	2500
a2	4000	2500
a1	4200	2500

https://docs.microsoft.com/en-us/sql/t-sql/language-elements/set-operators-except-and-intersect-transact-sql#:~:text=INTERSECT%20returns%20distinct%20rows%20that,the%20same%20in%20all%20queries.