Answer: Frightening
Explanation: The only 3 options would be concerned, suspicious, and frightening but concerned and suspicious are pretty much the same
Could you place a picture of your paragraph? My text seems to have different line numbers...
A parenthetical element<span> is a word or group of words that interrupts the flow of a sentence and adds additional (but nonessential) information to that sentence. This</span>element<span> can be long or short, and it can appear at the beginning, the middle, or the end of a clause or sentence.</span>