Short answer: "That" is used to introduce essential clauses or information, while the pronoun "which" is used to add non-essential or non-defining clauses. Also, these non-essential clauses are set off with commas.
Explanation:
First of all, the words "that" and "which" are both relative pronouns; this means, both introduce clauses that describe a noun previously mentioned. However, the pronoun "that" should be used only to introduce essential or defining clauses (information that cannot be omitted); for example "She is the woman that I love". On the other hand, the word "which" introduces information that is not essential or non-defining clauses; for example "The house, which is located near the sea, is stunning". Moreover, clauses introduced by which are set off in commas to show they are not essential.
The correct choice is of course <u>to </u><u>determine </u><u>the </u><u>most </u><u>important </u><u>facts </u><u>and </u><u>information.</u><u>.</u><u>. </u>
There are small moments in the book that are left out of the film, like Ponyboy breaking a glass bottle to threaten a Soc but picking up the glass after so no one gets a flat tire, that is left out of the movie and makes Ponyboy's character a little more difficult to understand.
