Please help. I don't understand why (C) is wrong.

Stimulus: No combining publicity appearance and competition. So it is "not both" rule.

PA-->/Competition, or it could be Competition -->/PA

PA-->/Competition

Competition

_________________

/PA

(C)

Tomato thrive --> Hot Summer

/Hot Summer

______________________

/Tomato thrive

I was also having trouble subtle differences of serious emergency and critical emergency.

(B)

less serious emergency -->/critical emergency

fairly minor emergency

____________________

/critical emergency

I would think fairly minor emergency would also be non critical emergency....