The correct option is C Heterosporous
Based on the number of types of spores produced, pteridophytes can be classified into the following two types:
1. Homosporous - Most pteridophytes are of this type. They produce all spores of similar kind. Example - Dryopteris
2. Heterosporous - Some genera like Selaginella and Salvinia produce two kinds of spores, macro (large) and micro (small) spores.