This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

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Answer
b. Soap or liquid soap
Welcome back Ray-chee — missed you this week.
The correct option is b).
Step 1: Analyze the scenario. The learners are rinsing their hands with water only. The question asks for the key component missing from best hygiene practices that greatly reduces bacteria.
Step 2: Evaluate the options based on their role in reducing bacteria during handwashing.
Step 3: Conclude the most critical missing component. For handwashing with water, soap is the key component that greatly reduces bacteria by physically removing them from the hands.
The final answer is
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Welcome back Ray-chee — missed you this week. The correct option is b).
This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.