Final answer:
To ensure valid data collection, the tool should be unbiased, measure what it is supposed to measure, and be accurate and consistent. It is crucial for researchers to use reliable and valid instruments. Hence the correct answer is option B and C
Step-by-step explanation:
In order for data collection to be valid, the tool must be unbiased, measure what it is supposed to measure, and be consistent and accurate. Reliability refers to the ability of the tool to produce consistent results, while validity refers to the extent to which the tool accurately measures what it is intended to measure. It is important for researchers to use tools that are both reliable and valid.
Hence the correct answer is option B and C