Ans B.
poised – having a composed and self-assured manner. Having self-confidence.
Eg. economic times | Aug 12, 2020, Are domestic stocks poised for a fall from the cliff?
thepienews, India “poised” to be largest student source market.
plunged – fall suddenly and uncontrollably. to move or fall suddenly forward, down, or into something
CNBC | AUG 12, 2020, UK enters recession after GDP plunged by a record 20.4% in the second quarter.
Hindustan Times | Aug 12, 2020, 1 dead as SUV plunges into gorge in Uttarakhand, monsoon mayhem blights state.
plugged – block or fill in (a hole or cavity)
Times of India | Aug 9, 2020, Government: Gaps in data will be plugged.
probed – physically explore or examine (something) with the hands or an instrument.
Business Standard | Aug 9, 2020, Expert who probed Mangalore crash lists likely reasons for Kozhikode mishap.