We discussed in the lecture about a study in Sydney that finds that a 1% increase in humidity is associated with a 7.7%

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We discussed in the lecture about a study in Sydney that finds
that a 1% increase in humidity is associated with a 7.7% increase
in COVID-19 infections. Let's assume this finding is based on a
single linear regression. Suppose more humid suburbs are close to
the sea (e.g., Bondi) and are more crowded. Also, suppose
crowdedness can cause an increase in COVID-19 infections. Which of
the following is correct?
There is no omitted variable bias.
We can interpret the result from the study as a causal effect of
humidity on infections.
The study tends to overestimate the causal effect of humidity on
infections
The study tends to underestimate the causal effect of humidity
on infections