Sexual Reproduction Has Not Been Observed in Bd

Multiple Choice

Sexual reproduction has not been observed in Bd.A Bd sporangium initially contains a single haploid cell.Which of the following processes must be involved in generating the multiple zoospores eventually produced by each sporangium?
1) S phase
2) cytokinesis
3) mitosis
4) meiosis

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1,2,and 3 only
E) 1,2,and 4 only