Consider the regular grammar generating the set of all strings ending in 00
S $\rightarrow$ 1S $\mid$ 0P
P $\rightarrow$ 0C $\mid$ 0 $\mid$ 1S
The production missing is
- C $\rightarrow$ 1S
- B $\rightarrow$ C1
- D $\rightarrow$ C1
- A $\rightarrow$ $\varepsilon$
Solution is given option A