The correct answer is D.
When designing a personal fitness program you should take into consideration what your goals are meaning what you want to realistically achieve, what activities you would like to do to get fitter and where and how you can do them and then create a variety of activities for yourself so you don't get bored and lose interest in your fitness plans.
White blood cells surround and digest bacteria. White blood cells produce antibodies that destroy pathogens. The middle one, I don't know yet, and the ones at the bottom, I'm still figuring out.
Weathering will be the correct answer to the question you have asked.
