The correct options are
B Day 2
C Day 3
D Day 4
According to the graph, the temperature on the following days are as given below:-
Day 1 - 45.5 ∘C
Day 2 - 44 ∘C
Day 3 - 44 ∘C
Day 3 - 44.5 ∘C
Therfore, temperature of day 2, day 3, and day 4 are below 45 ∘C.