Type of cell whose shape and structure enable it to perform a particular function

The right answer is  Specialized cell (or differenciated cell).

A specialized cell has a whole series of activated genes that contribute to its well-defined identity.

For example, an epidermis cell is a specialized cell: it produces keratin and divides into other epidermal cells ... its precise function, as well as its shape, its lifespan

In animals, once the cell is specialized, in general it is definitive! It is the plants, each cell can lose its specialization is becoming undifferentiated.

B. Organogenesis 
Is the process of the development of organs in an embryo, therefore the correct answer

As Gastrulation is the initial group and combining of cells into a blastocyst. And Neurulation is the formation of the neural plate and tube to lay the foundations for the nervous system.