(C) Formation of fruit
Since 'P' labels the pistil (female reproductive part), removing it prevents fertilisation, and thus the ovary cannot develop into a fruit.
Source: Sexual Reproduction in Flowering Plants, Chapter 7, Section 7.3.2
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The figure shows 'P' pointing to the pistil (centre of the flower). The pistil contains the ovary, which after fertilisation develops into the fruit (and the ovule into the seed). Without the pistil, pollens can still form (from stamens), the flower already exists, and seeds cannot form either — but the direct consequence most clearly linked to removing the pistil is no fruit formation, which is the standard expected answer. Note: formation of pollen (option A) depends on the stamen, not the pistil, so that is unaffected.