Here are the answers of the following: 

(a) Abortions can occur spontaneously. – True
Some miscarriages happen naturally due to health or genetic issues.

(b) Infertility is always caused by abnormalities in the female partner. – False
Infertility can be due to problems in either male or female partners.

(c) Complete lactation can act as a natural contraceptive. – True
Exclusive breastfeeding delays ovulation, temporarily reducing the chance of pregnancy.

(d) Creating awareness about sexual health effectively improves reproductive health. – True
Awareness helps people make safer decisions and adopt healthy practices.