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A

Explanation:

The thermal capacity of a substance refers to the amount of heat required to raise the temperature of the body by 1 K.

The larger the thermal capacity of a body, the greater the amount of heat energy that can be stored in the body.

Secondly, the greater the increase in nighttime temperature, the more the thermal energy transferred to the block hence the greater the thermal  energy stored in the block.

Therefore, a block of large thermal capacity and large nighttime increase in temperature will have the most amount of thermal energy stored in it.