Correct Option (C)
The author's assumption regarding scientific research is explicitly stated in the passage: "Scientific research is probably never completely valueless." This indicates that even research that appears trivial, insignificant, or mechanically conducted inherently possesses some potential for value. The passage suggests that such research can provide foundational facts that a talented investigator might utilize for fruitful generalizations, thereby confirming that it is never entirely without some form of utility or significance.
Incorrect Options:
- Option 1 (it is never very valuable): This statement contradicts the author's view. The passage implies that scientific research, even if initially appearing insignificant, can yield results of value to a talented investigator. Therefore, it is not accurate to state it is never very valuable.
- Option 2 (it is sometimes very, valuable): While scientific research can indeed be very valuable at times, this option does not fully capture the author's fundamental assumption. The author's core premise is that scientific research is "never completely valueless," implying a constant, albeit potentially minimal, inherent value, rather than just occasional high value.
- Option 4 (it is always very valuable): This is an overstatement of the author's position. The passage acknowledges that scientific research can sometimes seem "silly and insignificant." While it asserts that such research is "never completely valueless," it does not claim it is "always very valuable." The value might be latent or require further interpretation by a skilled individual.