The correct answer is C. The ability to survive until it reproduces.
In order for any individual organism, including a pangolin, to reproduce, it must survive long enough. For pangolins, this means surviving at least two years. Females, in addition, must survive through gestation so that they can give birth. It is not necessary that they bear multiple young or fight off predators, so long as they can avoid or survive predators. Only female pangolins need to be able to lactate—or produce milk—if they want their offspring to survive to adulthood.