I would say the correct answer is that has an undetermined answer.
If a subject has been thoroughly covered, then there is no need for this researcher to do it all over again. If it's impossible to answer, there is no need to try. If it can be answered easily, then it doesn't really require a research. This leaves us with the last option, because a researcher might want to try and determine the answer.
A tie
a tie to someone you can hold on,
a tie can be broken
Answer:
Pear
Explanation:
A pear will ripen the fastest/quickest, In a case if you are keeping it in a chill like container for a long period of time, A pear will ripe faster the longer you keep it in a cold/chill time duration
