If two measurements are very close to each other, then they are
a.
accurate.
b.
precise.
c.
both accurate and precise.
d.
accepted values.

I'd say b, precise, here.
If there's an error somewhere in the experiment or project, then it is consistently wrong. So, just 'cos you measure something precisely, it doesn't mean that you've measured it accurately. Maybe an example would be a measurement of length. If you used a metal ruler at zero degrees C, you can measure to say half a millimetre. A series of measurements of the same object would give very similar readings. But, if you used same metal ruler at, say 100 celsius (implausible) then you'd probably get a different set of readings. 'cos of the expansion of the metal ruler.

D accepted values because that's just how it is