]scientists are able to construct valid scientific methods to study the formation of the solar system by being

biased and religious
impractical and modest
imaginative and original
unreasonable and outdated

The correct answer will be option-imaginative and original.

Explanation:

The study of any natural phenomenon is based on the methods developed by humans. These methods are known as scientific methods as they approach the explanation in a systematic way.

The quest to understand the astronomical perspective-universe, planets and the planetary motions began around 2500 years ago which persists even today.  

To understand the solar system researcher has to be a keen observer, imaginative and truthful to the evidence and data recorded. The logical imagination is essential to study the solar system as one is not able to see the far objects. This practicality allowed the researcher to think and rethink over the laws governing the systems.

Thus, option-imaginative and original is the correct answer.

trig 15.3 cos