Find the synonym of the underlined word.

Unconscious learning is now considered to be of questionable worth.

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Invaluable

Dubious

Superficial

Secondary

answer is B.

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Detailed Solution

Concept: Synonyms means one in every two or more words or expressions of identical language that have identical or nearly identical meanings in some or all senses.
Now let’s find the required answer from the given options.
Option 1: The 'invaluable', refers to ‘having incalculable monetary, intellectual, or spiritual worth’. It's not the correct synonym for the word ‘questionable’. Thus, it's an incorrect option.
Option 2: The ‘dubious', refers to something ‘doubtful, dubious, dubitable, in question. It's the correct synonym for the word ‘questionable’. Thus, it's the correct option.
Option 3: The ‘superficial', refers to something ‘of little substance or significance’.
It's not the correct synonym for the word ‘questionable’. Thus, it's an incorrect option.
Option 4: The ‘secondary', refers to ‘inferior in rank or status’. It's not the correct synonym for the word ‘questionable’. Thus, it's an incorrect option.
Hence, the correct answer is option 2.

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