Answer: Option C
The word "barely" in the sentence indicates that the figures were not easily seen, so we need to choose an adjective that means something like "difficult to perceive." Let's take a closer look at each of the options:
A. "Obvious" means easy to see or understand, which is the opposite of what we're looking for in this sentence.
B. "Perceived" means detected or recognized through the senses, which is a possible choice, but it doesn't quite fit with the word "barely." If the figures were barely perceived, it would mean that they were almost not perceived at all, which is not necessarily the same as being difficult to perceive.
C. "Perceptive" means having or showing keen insight or understanding, or being able to perceive things easily or accurately. This fits well with the idea that the figures were difficult to see in the dim light.
D. "Susceptible" means likely or prone to be affected by something, which doesn't make sense in this context.
E. "None of these" is not the correct answer because option C, "perceptive," fits the sentence best.
Therefore, the correct answer is Option C, "perceptive."
In conclusion, understanding the meanings of the words in the options is essential to choose the correct answer in context. In this case, we were looking for a word that means difficult to perceive, and "perceptive" was the best fit.