What effect did the new study have on scientists' ideas about the way Earth's water formed? (A) Scientists are convinced that Earth mostly got the hydrogen for its water from other nearby planets that have water. (B) Scientists believe the solar nebula may have provided an extra source of hydrogen that helped water form on Earth. (C) Scientists are questioning whether asteroids even hit the Earth and helped it form the water on it. (D) Scientists are concerned that they will never learn the true cause behind the formation of water on Earth.

(C) Scientists are questioning whether asteroids even hit the Earth and helped it form the water on it.

Explanation:

The scientists are collecting evidence for the fact that the earth's water is the product of the gas left due to the formation of the sun and the asteroidal material. The fact finding inquiry related to this matter has also arose many questions related to the development of the other planets on the solar system and their potential to sustain or support life.

Hence, based on the above information, option C. is correct.

i'm pretty sure its b i might be wrong though!