Solution

The correct answer is n, E + n and E x n

EXPLANATION:

In the given grammar E → E + n | E x n | n, let's consider the sentence n + n x n.

• The right-sentential form during the reduction process will be as follows:
  • n + n x n  (Start with the original sentence)
  • E + n x n   (Apply the reduction E → n)
  • E x n         (Apply the reduction E → E + n)
  • E               (Apply the reduction E → E x n)

Therefore, the correct option is: 4) n, E + n, and E x n