In the question below, a blank has been given. Following the sentence, five options have been given. Find out which of the following options will fit in the sentence.

In order to find the murderer, the detective would have to _________________ the dark building for evidence.

Correct option is C

The correct choice is option(c) ‘investigate’ to form a correct sentence. The word "investigate" means to examine or inquire systematically in order to discover the truth or obtain evidence. In the given context, the detective needs to investigate the dark building to find evidence related to the murderer.
speak– to say words or to have a conversation
erode – to rub or rubbed away gradually
investigate – to examine a crime or a problem carefully, to discover a truth
declining– to gradually become less or worse
concentrate – to direct the attention towards a work or an activity