Correct Answer & Explanation
Option C
• The phrase 'By the end of this month' indicates a deadline or a specific future point in time by which an action will be completed.
• This situation requires the Future Perfect Tense.
• The Future Perfect Tense is used to describe an action that will be completed before some point in the future.
• The structure for Future Perfect Tense is Subject + shall/will have + V3 + Object.
• 'He' takes 'will have completed'.