Choose the best option to replace the underlined part to improve the given sentence. If no substitution is required, select 'No substitution.'
We need to focus in finding a sustainable solution.
Show answer & explanation
Correct answer: C
Explanation
The verb 'focus' is idiomatically followed by the preposition 'on' when indicating the subject or activity being concentrated upon. Therefore, the correct sentence is: 'We need to focus on finding a sustainable solution.'