(A) ** Upset
(B) Election
(C) Poll
(D) President-elect
EXPLANATIONS BELOW
Concept note-1: -: an act of throwing into disorder : derangement. (2) : a state of disorder : confusion. : an unexpected defeat.
Concept note-2: -upset verb [T] (WORRY) to make someone worried, unhappy, or angry: It still upsets him when he thinks about the accident. Don’t upset yourself by thinking about what might have been. Thesaurus: synonyms, antonyms, and examples.
Concept note-3: -UPSET (adjective) definition and synonyms | Macmillan Dictionary.
Concept note-4: -Answer. SUDDEN INVASION (4) RAID.