When Looking at a Linear Ascus of Spores in Neurospora,you

When looking at a linear ascus of spores in Neurospora,you find the following octet:
Leu-
Leu-
+
+
Leu-
Leu-
Leu-
+
This sequence of spores most likely arose as the result of

A) gene conversion.
B) mitosis.
C) meiosis I.
D) meiosis II.
E) mutation.