Final answer:
A process based strictly on chance and described statistically is 'd. random'. This is because the exact outcome cannot be predicted, only the probability of different outcomes can be stated.
Step-by-step explanation:
A process that is based strictly on chance and whose behavior can only be described statistically is d. random. Random processes are unpredictable and can only be understood in terms of probabilities and statistics, rather than deterministic equations or precise predictions.
For instance, flipping a coin is a random event; while we can statistically predict that about half the time we will get heads and half the time we will get tails over many flips, we cannot predict the outcome of any single coin flip with certainty.