This graph shows the number of scarves Lucy made in the first 6 days of knitting.
By Day 3, Lucy had made a total of 5 scarves (2 scarves on Day 1, 2 scarves on Day 2, and 1 scarf on Day 3).
On which day did Lucy and Martha not make any scarves?
A.
1
B.
3
C.
4
D.
5