The indefinite word in this sentence is "all'' because it is formed from a indefinite pronoun therefore it is a indefinite adjective.
The answer to your question is A. - Them because you are referring to the crumbs and just not something random, in which case you would use "it".
I hope this helps you!
Have a great day!!
Answer:
An expression designed to call something to mind without mentioning it explicitly, an indirect or passing reference.
Explanation:
Example: An allusion to Shakespeare.
