Answer:

Heading: Understanding the question

The given question is a multiple choice question (MCQ) with four options (a, b, c, d). The task is to identify the correct option out of the four given options. The correct answer is option 'C'. In order to understand why option 'C' is the correct answer, we need to analyze the question and the given options.

Heading: Analyzing the options

Option 'A' is not the correct answer because it is incomplete. The given blank needs to be filled with a suitable word or phrase. The option 'A' only provides the first letter of the word, which is not sufficient to identify the word.

Option 'B' is not the correct answer because it is grammatically incorrect. The given sentence is in present tense, and the option 'B' uses a past tense verb, which is not appropriate.

Option 'C' is the correct answer because it is grammatically correct and makes sense in the given context. The blank is filled with the appropriate word, which is 'is'.

Option 'D' is not the correct answer because it is grammatically incorrect. The given sentence is in present tense, and the option 'D' uses a future tense verb, which is not appropriate.

Heading: Conclusion

In conclusion, the correct answer to the given multiple choice question is option 'C' because it is the only option that is grammatically correct and makes sense in the given context. The other options are either incomplete, grammatically incorrect or use inappropriate tenses. It is important to read the question carefully and analyze the options before selecting the correct answer.