B. If it is raining, bring an umbrella regardless.
Explanation:
Here is the code syntax:
<em>while </em>_ = <em>true</em>
<em> print</em>(rain)
In short words, this syntax is basically saying while a condition is true, do this. "This", is the function run under the true condition. For while loops to work, at least one condition of anything must be true.