What is the chromosome number in calyptra, perichaetial cells, columella and protonema if endothecium cell contains 20 chromosomes?
A. 10, 10, 20, and 10, respectively
B. 10, 20, 20, and 10, respectively
C. 20, 10, 20, and 10, respectively
D. 10, 10, 20, and 10, respectively
