Correct Answer: Efficient

Solution : The third option is the correct answer.

The word efficient is correctly spelt, and it means achieving maximum productivity with minimum wasted effort or expense.

The meanings of the other options are as follows:

• Concurently: The correct spelling is "concurrently", meaning at the same time.

• Strateigy: The correct spelling is "strategy", referring to a plan of action.

• Prodactivity: The correct spelling is "productivity", which is the state or quality of being productive.

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