Modified dihybrid ratio 9:7 observed by Bateson and Punette was found in
Pisum sativum
Cucurbita pepo
Lathyrus odoratus
Zea mays
As we have already studied in Complementary factor -
Modified dihybrid ratio of 9:7 was observed in complementary gene interaction
Complementary factor was first discovered in Lathyrus odoratus.
Hence, the correct option is (c).