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!!
Because, they had to push it back farther
First of all their environment if they are in bed or at school can effect performance. Personally I do better at home because it’s more comfortable. However some people get distracted and need to talk in person. Also if there is any mental health issues that your bypassing this can effect your efficacy to work. Most people with issues like these end up procrastinating their work. The teachers can effect how well you learn. This is based on what methods and their attitude towards their students and school. If a student has a hard time at home or outside of school they may not even care about school. There’s so much more like parental pressure, sports, etc. But this is all I can think of for now.
