Fill in the blank with an appropriate option.

Choosing the right software for any purpose can be a/an ________ task for any business.

challenging

The correct answer is challenging.

The word challenging means difficult or demanding. In this sentence, the speaker is saying that choosing the right software for any purpose can be a difficult or demanding task for any business.

The options intimating, flickering, and attributing are not as appropriate because they do not have the same meaning as challenging. For example, the option intimating means suggesting or hinting at something, but this is not the same as being difficult or demanding. The option flickering means moving or shining with a sudden, brief, unsteady light, but this is not the same as being difficult or demanding. The option attributing means assigning something to a particular cause or source, but this is not the same as being difficult or demanding.