Failure to ovulate in a given cycle is likely if
A. Pregnanediol appears in the urine in the second half of the cycle.
B. Basal body temperature is constant throughout the cycle.
C. Unilateral abdominal pain is experienced at mid-cycle.
D. Cervical mucus showed evidence of unopposed oestrogen action in the second half of the cycle.
E. The endometrium shows proliferating glands in the second half of the cycle.