The answers are B and C because the other 2 are unhealthy
In women's menstrual lining, the tissues will keep on activating hormones until the right thickness of the lining of the menstrual is achieved, which would fall on the positive feedback. Then, when the estrogen hormones are being passed on the blood, it travels to the pituitary gland to tell the follicle stimulating hormone to stop producing.
Red-shifted
This is because the golf length is getting bigger, and a bigger golf length is corresponding with red.
The first selection is moons. I'm not too sure about the second. Wild guess leonardo dicaprio