Question

to describe the length of a classroom, a student should use
a centigrams
b centimeters
c kilometers
d meters

Explanation:

Step1: Analyze each unit

• Option A: Centigrams are units of mass, not length. Eliminate A.
• Option B: Centimeters are too small for a classroom length (a classroom is several meters long, centimeters would give a large number).
• Option C: Kilometers are too large (1 kilometer = 1000 meters, a classroom is not kilometers long).
• Option D: Meters are a suitable unit for measuring the length of a classroom (typical classrooms are a few meters to around 10 - 20 meters long).

Step2: Confirm the correct unit

After eliminating the incorrect units (mass unit, too small, too large), meters (Option D) is the appropriate unit for classroom length.

Answer:

D. meters