Based on "blending inheritance", which darwin and his contemporaries believed in, if a finch with a large beak depth mates with a finch with a small beak depth, then the offspring will have:
a. a beaks with large depth.
b. beaks with random depth.
c. beaks with small depth.
d. beaks with medium depth

D)  beaks with medium depth

Explanation:

 According to the question, the offspring will be having the beaks with the medium depth as, the blending inheritance the offspring tend to having the characteristics that are medium between the parents and when the organisms with the long beak with the organism of the short beak then it produces the medium beak depth.

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