Answer:
Sentence 2: The packages became too heavy for me, I dropped them
Step-by-step explanation:
These are the 8 basic rules of commas:
1.) USE A COMMA TO SEPARATE INDEPENDENT CLAUSES.
The second part of the sentence, "I dropped them", is not an idependant clause, so a comma would make the sentence grammatically incorrect.
2.) USE A COMMA AFTER AN INTRODUCTORY CLAUSE OR PHRASE.
The second part of the sentence (in this case) is the predicate phrase, so it's too late in the sentence for the comma.
3.) USE A COMMA BETWEEN ALL ITEMS IN A SERIES.
There are no items that need to be listed in the sentence.
4.) USE COMMAS TO SET OFF NONRESTRICTIVE CLAUSES.
A non-restrictive clause is a clause that provides additional, non-essential information. It's essentially just extra detail. The second part of the sentence is a dependant clause, and not used for detail at all.
5.) USE A COMMA TO SET OFF APPOSITIVES.
An appositive is a noun or noun phrase that renames the noun next to it. In the second part of the sentence, there's only a verb phrase, so there's no noun to rename.
USE A COMMA TO INDICATE DIRECT ADDRESS.
6.) There's no direct adress or proper noun anywhere in the sentence.