First you should kblnow that what are these three modes of material actually. For this you have to read in context.
Bhagwad Gita 14:5
O mighty-armed Arjun, the material energy consists of three guṇas (modes)—sattva (goodness), rajas (passion), and tamas (ignorance). These modes bind the eternal soul to the perishable body.
So these three modes are ...