Which of the following is a correct simple sentence?

Choose the correct sentence.

Correct the following sentences:

(a) I wish I can get the chance of Admission in 'Bangladesh University of Textile!'

(b) By and by he became rich..

(c) Fertilizers are used primarily to enrich the soil and increasing yield.

Identify the correct sentence.

Identify the part of the sentence that needs correction (Questions 19-20):

The dog wagged it's tail happily.