Final answer:
An effusive remark expresses emotions in an unrestrained or excessive way. Option B.
Step-by-step explanation:
The word 'effusive' describes a remark that expresses emotions in a very enthusiastic, unrestrained, or excessive manner. The correct answer to fill in the blank is B. 'Effusive.'
When someone is effusive, they show their feelings of pleasure, gratitude, or approval in a very enthusiastic way, often more openly or freely than usual.
This contrasts with being earnest, which means showing sincere and intense conviction, being ecstatic, which refers to being overwhelmingly happy and being eccentric, which describes having an unconventional or slightly strange behavior.
Hence, the right answer is option B.