What characteristics identify a European Chaffer grub?

The identification of a European Chaffer grub is primarily based on its distinctive characteristics, which include a Y-shaped anal slit and parallel rows of rasteral spines. These features are critical for distinguishing this species from other grubs. The Y-shaped anal slit, in particular, is a unique identifier that helps in recognizing the European Chaffer grub specifically.

In contrast to other options, the features mentioned in choice B are not present in the other options, which describe characteristics of different species or types of grubs. The curved body and segmented abdomen, while common traits among various grubs, do not uniquely define the European Chaffer. Thus, recognizing the significance of the Y-shaped anal slit and the parallel rows of rasteral spines is crucial for accurate species identification in pest management and agricultural practices.