The best way to phrase the question about a watch losing time is 'Are five minutes lost daily by your watch?', thus utilizing the passive voice correctly. The correct answer is option a.
The correct way to phrase the question is option a) Are five minutes lost daily by your watch? This question is a passive form of the original statement, which is also grammatically correct and conveys the same information. The passive voice is often used when the focus is on the action (in this case, the watch losing time) rather than who or what is acting.
Option b) is incorrect because it incorrectly implies that the watch itself is being lost rather than time. Option c) turns the statement into a declarative sentence, which is not asking a question. Option d) has an awkward phrasing and is less common; the adverb daily is usually placed before the object (five minutes).
Therefore, option a is corect.