Concept:Synonyms are words that share a similar meaning. The word 'significant' refers to something of great importance or value.
Explanation:First, understand the meaning of 'significant' – it means having great significance, value, or influence.
Now, check each option: 'prominent' means standing out or famous, not exactly the same as 'significant'. 'magnificent' means extremely beautiful or impressive, which is different. 'efficient' means achieving maximum output with minimum waste, unrelated. 'important' means having great value or influence, which directly matches the meaning of 'significant'.
Therefore, 'important' is the correct synonym.
Answer:Option D: important
