I got it right by eliminating the answers which were wrong. Incidentally, maybe this is something specific with SSRS (which I have no experience with), but my initial instinct was to say that none of the answers was correct as the query would return with the following:
"Must declare the scalar variable '@startDate'"
Probably being too nitpicky about that though... :-D
Within SSRS, when a query is written with variables like this, when the report is compiled, parameters are build, which must be populated (via user input) before the report is run.
Space, the final frontier? not any more...
All limits henceforth are self-imposed.“libera tute vulgaris ex”