根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中的两项为多途选项。
Carrots are easy to raise and easy to harvest. They taste good.  
When people think of carrots, they usually picture in their mind a vegetable that is long, thin and orange.       And not all carrots are orange. For example, Paris Market carrots are about five centimeters around. Rome carrots are thin and about twenty-five centimeters long. And Belgian White carrots are, as their name suggests, white.
For the best results, carrots should be grown in sandy soil that does not hold water for a long time. The soil also should have no rocks. To prepare your garden for carrots, dig up the soil, loosen it and turn it over. Then, mix in some plant material or animal fertilizer (肥料).
   Experts say warm days, cool nights and a medium soil temperature are the best conditions for growing carrots that taste great.
Carrots need time to develop their full sugar content. This gives them their sweetness if you wait too long to pull them from the ground.       Usually, the brighter the color, the better the taste.
 If the winter is not cold enough to freeze the ground, you can grow and harvest carrots the same way as during the summer months. If the ground does freeze, simply cover your carrot garden with a thick layer of leaves or straw. This will prevent the ground from freezing.
A. But carrots come in many different sizes and shapes.
B. They are economic crops.
C. The best time for planting carrots is during the winter months.
D. Weather, soil conditions and age will affect the way carrots taste.
E. The best way to judge if a carrot is ready to be harvested is by its color.
F. And they contain a lot of carotene (胡萝卜素), which the body make into vitamin A.
G. Many people do not know that carrots can be grown during the winter months.