Support Alice will volunteer to work on the hospital fund-raising drive only if her brother Bruce also volunteers and a majority of the others working on the drive promise to select Bruce to manage the drive. ████████ ████████ █████ ██ ███████ ██ ██████████ ████ ██ ███ ██████ ███████ ██ ███ █████ ████ ███████ ██ ██████ █████ ██ ██████ ███ ██████ ████ ██ ██ ███████ ████ █████ ████ ███ ██████████
The stimulus can be diagrammed as follows: 
In which one of the █████████ █████████ ██ ███ ███████ ██ █████████ ████ ███████ ██ ███ ███████ ██ █████████ ██ ███ ████████ ██████
Bill and Steve ████ ████ ████████ ██ ███ ████ ████ ████████ ████ ██ ████ ███ ██████ █████ ████████ █████ ████ ███ █████ █ ███ ███████ ██ ███ █████████ ██ ██ ██████ ████ █████ ████ ████ █████ ██ ███ █████
Mismatched conclusion. The strength of the conclusion of (A) does not match the strength of the conclusion of the stimulus. The stimulus concludes that something certainly will not happen; the conclusion of (A) says that something is likely.
Leon will go ██ ███ ██████ ████ ██ ████ ████ █████ ████████ █████████ ██ ███ ███████ ████ ████ ███ ████ ██ ██ ██ ███ ███████ ██ ██ ██ ███████ ████ ████ ██ ███ ████████ ██ ███
Mismatched premises. The stimulus gives a sufficient condition with two independent necessary conditions, then negates one of those necessary conditions. (B) gives a sufficient condition (Leon going) with one necessary condition (Vera going), then negates the sufficient condition (/Leon going).
Jim will go ██ ███ █████ ████ ██ ████ ███ ███ ██████ ████ ███ ███ ██ █████ ██ ███ ██████ ███ ██████ ██ ███ ██████ ██ ██ ██ ███████ ████ ███ ████ ███ ██ ██ ███ ██████
The diagram of (C) matches the diagram of the stimulus:

If Paula works ████ ██████ ████ ████ ████ ████ ████ ██████ █████ ████████ ██ █████ ████ ███ █████ █████ ████ ████ ████ ████ █████ ██ ██ █████ ████ ███ █████ ██████ ████ ████ ████ ████ ████ ███ ██████
Mismatched premises and conclusion. The stimulus gives a sufficient condition with two independent necessary conditions. (D) gives a sufficient condition (Paula working with Elise) with one necessary condition (Jane working with Arthur).
The stimulus makes a straightforward conclusion that Alice will not volunteer; (D) makes a conditional conclusion (/Paula→ Arthur with Jane and Elise)
Therese will work ██ ███ ████ ████████ ████ ██ █████ █████ ███ ███ ██ ██ ███ ████████ ████████ █████ ████ ███ ████ ███████ ██ ███ █████ ███ ████ ████ ████████ ██ ██████ ██ █████ █████████ ███████ ████ █████████ ████ ██ ███ █████
Mismatched conclusion. Unlike the stimulus, (E) makes a conditional conclusion (/rain→work).
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