look at these details from a paragraph about the same topic:\n- carrying a heavy backpack can put extra…

look at these details from a paragraph about the same topic:\n- carrying a heavy backpack can put extra strain on back muscles.\n- a persons neck muscles may get strained or sore after carrying a heavy backpack.\n- wearing heavy backpacks may cause people to lose their balance.\nchoose the main, or central, idea that ties all the details together.\ncarrying a heavy backpack can cause muscle strain and loss of balance.\ncarrying extra school supplies can make a backpack become heavy.\ncarrying a heavy backpack may cause you to fall.\ncarrying a heavy backpack on one shoulder may lead to bad posture.

look at these details from a paragraph about the same topic:\n- carrying a heavy backpack can put extra strain on back muscles.\n- a persons neck muscles may get strained or sore after carrying a heavy backpack.\n- wearing heavy backpacks may cause people to lose their balance.\nchoose the main, or central, idea that ties all the details together.\ncarrying a heavy backpack can cause muscle strain and loss of balance.\ncarrying extra school supplies can make a backpack become heavy.\ncarrying a heavy backpack may cause you to fall.\ncarrying a heavy backpack on one shoulder may lead to bad posture.

Answer

Brief Explanations:

The details mention back muscle strain, neck muscle strain/soreness (muscle - related issues) and loss of balance. The first option "Carrying a heavy backpack can cause muscle strain and loss of balance" combines these key points. The second option is about what makes a backpack heavy, not the effects. The third option only focuses on falling (a part of balance issue but not comprehensive). The fourth option is about posture which is not mentioned in the given details.

Answer:

Carrying a heavy backpack can cause muscle strain and loss of balance.