Final answer:
To take samples at a consistent interval and location, choose option c) interval.
Step-by-step explanation:
To take samples at a consistent interval and location, you should choose option c) interval.
For example, if you want to collect water samples from a river to measure pollution levels, you could take a sample every hour at the same location along the river. This would ensure that you are collecting data at regular intervals and from the same spot.
Taking samples at consistent intervals and locations is important in scientific research to ensure the accuracy and reliability of the data.