Question

Which syllogism is solid?

A. Gloomy is a bear, and all bears eat people, so Gloomy must eat people.
B. Jane is a girl, and all girls have brown hair, so Jane has brown hair.
C. That tree is dead, and it was windy last night, so the wind must have killed the tree.
D. The store mailed Erin a coupon, and Erin uses all the coupons she gets, so Erin will use the store's coupon.