Find the synonym of the underlined word.
Excavation for the first atomic power plant started officially in 1954.

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Planning

answer is D.

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Concept: Excavation could be a noun which springs from the verb, ‘excavate’, which suggests to unearth something.
Planning means to strategize something. We observe that it doesn't have the identical meaning as excavation. So, it is an incorrect answer.
Preparations are plural for preparation in specific contexts, which implies to induce ready or prepared for something. We observe that it doesn't have the identical meaning as excavation. So, it is an incorrect answer.
Exploration means to explore or discover something. We observe that it doesn't have the identical meaning as excavation. So, it is an incorrect answer.
Digging means to unearth or to get hold of. We observe that it's the identical meaning as excavation.
Hence, option D is the correct answer.