Discussion
If a measure has high validity :
Answer: B
If a measure has high validity, it must have high reliability.
Reliability is consistency of measurement and validity is measuring what is intended. An unreliable measure gives inconsistent results, so it cannot measure the intended thing accurately. Reliability is therefore a necessary condition for validity: every valid measure is reliable, though a reliable measure need not be valid.
The other three options all say reliability is unimportant or optional, which contradicts this relationship.
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