A. In order to attain optimal health
Feedback The use of the infinitive 'to' and the gerund 'attaining' together makes the given sentence ungrammatical. It has to be either 'In order to attain ...' or 'For attaining ...' Choices (C) and (D) are incorrect as 'Health' is uncountable and does not take the article 'an'.
B. In order to attain optimal level in health
C. For attaining an optimal health
D. In order to attain an optimal health