A pirate has buried his treasure chest under a beach, and he drew a map of the beach in the form of a grid where each section is numbered from 1 to 49 as shown in the diagram below:

The shape of his treasure chest is made up of squares like those shown in the choices below which are aligned perfectly with the grid above when buried. To find his way back to the treasure, he made a note of the sum of all the grid numbers that sit above the chest once buried. If the sum is 86, which of the following is a possible shape for the chest?
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which class are u studying
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