For the most effective presentation it's best to

The correct answer to complete the statement should be: "organize, plan, and implement a step-by-step development with concluding remarks".

Explanation:

The best presentation depends on a lot of factors, subjects and demands, although there are some strategies to solve problems and organize all things as much as possible. Therefore, the most effective presentation needs a great organization, including some planning, scripts, points, (numbered) topics, arguments, examples, real life situations and contexts etc. Moreover, it needs a step-by-step development in order to facilitate its comprehension and keep all things as much didactic as it must be, including final comments and concluding remarks for possible discussions and/or future researches and/or presentations. This pattern for an effective presentation may be applied to any research field and/or type of presentation.