Correct Answer: freely

Solution : The correct answer is option 4.

Explanation:

• 'Freely' is the correct answer
• The words 'adequate' and 'frequent' are adjectives.
• - The words 'free' and 'freely' are adverbs.
• - The definition of 'free' is without cost or payment, and the definition of 'freely' is not subject to the control of another.
• - In this situation, the phrase 'freely' is most appropriate.
• - As a result, to make the statement grammatically correct, the word 'freely' should be employed.
• - As a result, the right answer is 'freely'.
• Correct sentence: We freely alluded to his views.