Which of the following is a factor in determining whether to go missed on approach?

The factor of DME (Distance Measuring Equipment) or time is crucial in determining whether to go missed on approach because it directly relates to the aircraft's position in relation to the runway and the timing of the approach. When executing an approach, pilots are reliant on specific distances and times to make informed decisions about their descent, approach angles, and whether they are successfully lined up to land. If the aircraft is not at the right DME reading or time interval as defined in the approach procedure, it indicates that the approach may not be stable or safe to continue, thus necessitating a missed approach.

In essence, using DME or time provides key indications for the pilot to assess their situation in real time during the approach phase. If the DME readings suggest the aircraft is not where it should be, or if the elapsed time compared to the expected time indicates a problem, a missed approach is warranted to ensure safety.