A teacher has taught measurement of area to class VIII child

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A teacher has taught measurement of area to class VIII children, but many of her students are confused between the usage of different units of area and volume. What could be the reason for such a confusion in children?

[CTET Dec 2018 Paper 2 Math & Science(Hindi - I, English - II),CTET Dec 2018 Paper 2 Math & Science(English - I, Hindi - II)]

A The children have not memorized different units.

B Different units have been introduced all together without relating them with their daily life.

C The concept of measurement of area is a difficult topic for a class VIII learner.

D The children did not know the use of units for area.