Select the most appropriate option to substitute the bold

Solution

The word “appreciable” means noticeable or significant in amount, which doesn't suit the context of describing a speech.

The intended meaning is that the speech expressed gratitude or praise, for which the correct word is “appreciative.”

“Appreciating” is a present participle, not suitable here.

“Appraised” relates to evaluating or estimating value, not relevant to speech tone.

“Apprehensive” means anxious or fearful, which also doesn’t fit.