This passage from the christian gospel of Matthew reflects which of the Five Pillars of Islam?

"So when you give to the needy, do not announce it with trumpets, as the hypocrites do in the synagogues and on the streets, to be honored by others. Truly I tell you, they have received their reward if full. But when you give to the needy, do not let your left have know what your right hand is doing, so that your giving may be in secret. Then your Father, who sees what is done in secret, will reward you. "
- Matthew 6:2-4

a) pilgrimage
b) charity
c) fasting
d) worship