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Question

It is difficult to burn a heap of green leaves because ____________.
the green colour prevents them from burning
the size of the heap is too large
they contain a great amount of moisture which makes the ignition temperature high
of the thick material from which they are made

A

of the thick material from which they are made

B

the size of the heap is too large

C

the green colour prevents them from burning

D

they contain a great amount of moisture which makes the ignition temperature high

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Solution

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The correct option is D they contain a great amount of moisture which makes the ignition temperature high
The heap of green leaves has a great amount of moisture content which makes the ignition temperature high. Hence it is difficult to burn green leaves.
So, the correct option is $D$

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