Directions: Three sentences are given below. Find the sentence(s) which is/are…

Directions: Three sentences are given below. Find the sentence(s) which is/are grammatically correct and choose the best possible alternative among the five options. If all the sentences are correct, choose "All are correct".

(i) Praise always stimulates him to make greater efforts.
(ii) The houses were not considered habitable.
(iii) They tried to assure him of their willingness to work.