As ann landers once remarked, "at age 20, we worry about what others think of us. at 40, we don't care what they think of us. at 60, we discover they haven't been thinking of us at all."

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.