Question

How can tides solve the power problem of the world?
A. Electricity is being produced through tidal waves.
B. Tidal waves keep the steamers in motion.
C. Tidal waves melt the ice and save power.
D. None of the above.

Answer 1

Hint: The structure of the sentence is the way a word is structured, grammatically. Where the noun and verb fall within an individual phrase is the sentence structure of your writing. The structure of sentences depends on the language in which you write or speak.

Complete answer:
The word "harness" means "to regulate and use (natural resources), especially to generate energy." The passage notes that:' Tidal waves are harnessed for the purpose of producing electricity. This means that in order to generate electricity or hydraulic power, the tidal waves are brought under control. This, in turn, could reduce or solve the world's power problem. Option A is therefore right.
The term 'steamer' refers to a steam-powered ship, boat, or locomotive. No power can be generated by keeping the steamers in motion. Ice melting does not help conserve power or produce electricity. Options B and C are, therefore, wrong. Option D is incorrect, as the correct answer is option A.

Additional Information:
English Sentence Structure
The following statements are true about sentences in English:
1. A new sentence begins with a capital letter.
He obtained his degree.
2. A sentence ends with punctuation (a period, a question mark, or an exclamation point).
He obtained his degree.
3. A sentence contains a subject that is only given once.
Smith obtained his degree.
4. A sentence contains a verb or a verb phrase.
He obtained his degree.
5. A sentence follows Subject + Verb + Object word order.
He (subject) obtained (verb) his degree (object).
6. A sentence must have a complete idea that stands alone. This is also called an independent clause.
He obtained his degree.

Hence the correct answer is option ‘A'.

Note: To understand the concepts for this kind of a question we should make our reading habit string. Good understanding of rules of tenses and a proper reading will help us to visualize the different formats of sentence structure.