Step 1: Define parthenocarpy.
Parthenocarpy is the development of fruit without fertilization.
Step 2: Understand the consequence of no fertilization.
Since fertilization does not occur:
ovules do not develop into seeds,
the ovary still develops into a fruit.
Thus, the fruit formed is seedless.
Step 3: Eliminate incorrect options.
(A) Seed fruit — incorrect, no seeds are formed.
(C) No fruit — incorrect, fruit does develop.
(D) Seed formation — incorrect, fertilization is required for seed formation.
Hence, the correct answer is
\[
\boxed{\text{Seedless fruit}}
\]