To solve this problem, we need to understand the process of fertilization in humans and the conditions required for it to occur.$\newline$Fertilization in humans typically occurs in the fallopian tubes, specifically at the ampullary-isthmic junction.$\newline$Let's analyze each option:$\newline \bullet$Option 1: The sperms are transported into vagina just after the release of ovum in fallopian tube.$\newline$ - This option suggests that fertilization is feasible if sperms are in the vagina right after ovum release.$\newline$ - However, fertilization occurs in the fallopian tube, not the vagina.$\newline$ - Therefore, this option is incorrect.$\newline \bullet$Option 2: The ovum and sperms are transported simultaneously to ampullary – isthmic junction of the fallopian tube.$\newline$ - This option correctly identifies the location where fertilization occurs.$\newline$ - The simultaneous presence of both gametes at this junction is crucial for fertilization.$\newline$ - Therefore, this option is correct.$\newline \bullet$Option 3: The ovum and sperms are transported simultaneously to ampullary – isthmic junction of the cervix.$\newline$ - This option incorrectly identifies the cervix as the site of fertilization.$\newline$ - Fertilization does not occur in the cervix.$\newline$ - Therefore, this option is incorrect.$\newline \bullet$Option 4: The sperms are transported into cervix within 48 h of release of ovum in uterus.$\newline$ - This option suggests that sperms need to be in the cervix within 48 hours of ovum release.$\newline$ - However, fertilization occurs in the fallopian tube, not the cervix or uterus.$\newline$ - Therefore, this option is incorrect.$\newline$Based on the analysis, the correct option is Option 2: The ovum and sperms are transported simultaneously to ampullary – isthmic junction of the fallopian tube.