Explanation:

Look around: to walk around a room, building, or place and see what is there.

When followed by the preposition 'for', the context changes to something particular such as 'the calculator' in the given sentence. So, the correct answer is option B.

Look out: to warn someone to be careful or to be vigilant.

Look up: to try to find a particular piece of information by looking in a book or on a list, or by using a computer.

Look by: look at a point next to.

Look on: watch without getting involved.