Please help. I’ll mark as brainliest if correct .
Each of the following groups of statements includes one main idea and two or three supporting details. Select the main idea.

1. Group 1
A. Some people knock on wood when talking about food luck.
B. Some people believe they should leave a house through the same door they entered.
C. There are many superstitions that are practiced in everyday life.

2. Group 2
A. Desert plants have various features that make them highly tolerant of long dry spells.
B. Many dessert plants have wavy leaves, stems, or branches that reduce water loss.
C. The roots of some desert plants often extend to great depths to tap the moisture there.

Group 3
A. School officials complain that students damage school property, and parents complain their children can’t read or do math.
B. Teachers complain about the low salaries they got for their difficult and important jobs.
C. The problem within our school systems are varied and affect almost everyone involved.