A couple is unable to produce a child as the male partner has low sperm count. Infertility caused by this condition can be treated using :

AI

The correct answer is option (2) -AI

Explanation:

• Artificial insemination (AI) is a fertility treatment that can be used when a male partner has low sperm count or other infertility issues. It involves the introduction of sperm into the female reproductive tract, typically through methods like intrauterine insemination (IUI).

The other options mentioned:

(A) ZIFT (zygote intra fallopian transfer): This involves transferring a fertilized egg (zygote) or early embryos (with upto 8 blastomeres) into the fallopian tube. It is a method used in some in vitro fertilization (IVF) procedures.

(C) GIFT (Gamete Intrafallopian Transfer): Transfer of an ovum collected from a donor into the fallopian tube (GIFT – gamete intra fallopian transfer) of another female who cannot produce one, but can provide suitable environment for fertilisation and further development

(D) IUT (Intrauterine Transfer): The zygote or early embryos (with upto 8 blastomeres) could  be transferred into the fallopian tube (ZIFT–zygote intra fallopian transfer) and embryos with more than 8 blastomeres, into the uterus (IUT – intra uterine transfer), to complete its further development.

So, in the context of the given scenario, the most appropriate treatment for male infertility with low sperm count is Artificial Insemination (AI).