In which of the following arrangements a wider spectrum of ideas and issues…

Concept

Formats of academic communication differ on two structural axes: how many distinct themes they can carry at the same time, and how many independent contributors they bring together. The spectrum of ideas a format can hold widens along both axes — a format organised around a single author or a single designated theme is narrow by design, while a format organised as many parallel thematic sessions drawn from many institutions is broad by design.

Application

Read the four arrangements against those two axes. A conference is a large formal assembly, usually spread over one or more days, whose programme is deliberately divided into several parallel thematic tracks — paper presentations, panel discussions, keynote addresses and poster sessions — and whose participants are scholars drawn from many different institutions. Both axes are therefore maximised together: many distinct themes run side by side, and a diverse body of contributors debates them. That combination is what makes a wider spectrum of ideas and issues possible.

Contrast

Placing every listed arrangement on the same two axes makes the difference explicit.

Result

Only the conference is broad on both axes at once, so the conference is the arrangement in which a wider spectrum of ideas and issues may be made possible.