Which item is among the first four steps of sequencing?

• A. screen participants
• B. processing
• C. 8-10 seconds
• D. Attitude

Answer: (A)

Sequencing steps are about the order of actions you take in a protocol. The first actions are those that establish safety and eligibility before anything else happens. Screening participants fits that role perfectly because it quickly checks who is suitable to participate, whether there are any medical or safety concerns, and what prerequisites are needed. This gatekeeping helps prevent risk before you move on to the next steps.

The other options don’t function as early procedural steps in the same way. A time range like 8-10 seconds is just a duration, not an action. Attitude describes a mindset or trait rather than a concrete step you perform. Processing could be a step, but without the context of the specific sequence, it isn’t clearly identified as one of the initial actions.