It is B. Because you cannot give internal fertilization/ live birth inside.
A portal of entry<span> is the site through which micro-organisms enter the susceptible host and cause disease/infection. Infectious agents enter the body through various </span>portals<span>, including the mucous membranes, the skin, the respiratory and the gastrointestinal tracts.</span>
<u>Ground tissue</u>, which is also known as cortex, is the main plant tissue shown in green in the image.