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