Directions: In a sentence given below, a part of the sentence is bold and underlined. Choose the correct alternative from the given options that may improve the sentence. In case no improvement is needed, mark your answer option 'D' i.e. ‘No improvement.’
A key step in control of any communicable disease is the separation of the ineffective agent from the susceptible hosts.
1
In the control of
2
for the control of
3
In controlling of
4
No improvement