A barometer kept in an elevator reads \( 76 \mathrm{~cm} \) when it is at rest. If the elevator ...

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A barometer kept in an elevator reads \( 76 \mathrm{~cm} \) when it is at rest. If the elevator goes up with increasing speed, the reading will be
(a) zero
(b) \( 76 \mathrm{~cm} \)
(c) \( <76 \mathrm{~cm} \)
(d) \( >76 \mathrm{~cm} \).
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