D, as 'Gerunds' is a verb and normally ends with ing in the present tense :)
Answer:
Hello there! I can see where this passage may have caused confusion. It stumped me for a little bit, but I have reached a conclusion.
Explanation:
The answer is C. 1. Newton developed his laws of gravity, 2. Einstein developed his explanation of gravity, 3. Scientists predicted black holes.
If you're wondering why, it's simple. In the second paragraph, it states "Glitches like this one were the reason Einstein worked so hard at coming up with a new explanation." Meaning, Einstein tried to come up with a more acceptable explanation for gravity because Newton's law had a few flaws. Therefore, the answer is C. Hope this provides you with the help you needed!
Have a great rest of your day!
Answer:
Joe worried about his enterance
Explanation:
some time in the 1950's or 60's
