A conference is identified as the arrangement where a wider spectrum of ideas and issues can be made possible. Let's explore the reasoning behind why a conference facilitates such a broad exchange of ideas compared to other arrangements:

1. Research Article: A research article focuses on presenting specific research findings or ideas by an individual or a group. It is often limited to the scope defined by the researchers and does not inherently provide a platform for real-time exchange of diverse ideas or issues.
2. Workshop Mode: A workshop is typically an event where a limited number of participants engage in intensive discussion and activity on a particular subject or project. Although it encourages interaction, it usually focuses on a specific theme or skill enhancement, limiting the range of ideas covered.
3. Conference: Conferences gather a diverse cross-section of individuals, including academics, professionals, and industry experts, to discuss a wide array of topics within a field or discipline. They allow for multiple sessions, panels, and discussions, providing a holistic platform for the exchange of information and perspectives across various topics.
4. Symposium: A symposium is an event aimed at presenting new research and developments, typically concerning a particular focus. Typically, a symposium allows for less generalized discussion than a conference, as it may revolve around more specialized topics.

Concluding from the above analysis, a conference enables the gathering of diverse groups of people, promoting a wider spectrum of ideas and issues to be discussed. Thus, among the given options, the correct answer is a Conference.