Geometry

Question Analysis
This question assesses the ability to select the right data collection method based on the research objective.
The main focus is on identifying a method that can gather relevant data about students' homework - related activities.

Key Concept Explanation
Conducting a questionnaire is an effective data collection method when the goal is to obtain specific information from a group, such as the average time students spend on homework.
It allows the researcher to directly ask the relevant questions to the target population.

Step-by-Step Solution
Option A, measuring the lengths of classroom desks, has no connection to the research question about homework hours, so it is incorrect.
Option B, observing the colors of students' backpacks, is unrelated to the topic of homework time.
Option D, counting the number of windows in the school building, does not provide a...