💡 Detailed Explanation
The correct answer is 「率直」 (satchoku), meaning 'frank', 'candid', or 'straightforward'. 「正直」 (shōjiki) means 'honest/truthful' and usually describes a personality trait rather than opinions. 「適切」 (tekisetsu) means 'appropriate'. 「気楽」 (kiraku) means 'easygoing/comfortable'.