The inflorescence in cauliflower is
A. Compound corymb
B. Corymb
C. Umbel
D. Catkin

Hint: Inflorescence is a flowering plant, a clump of flowers on a limb or a network of branches. An inflorescence is classified on the purpose of the arrangement of blossoms on a central axis (peduncle) and by the timing of its flowering (determinate and indeterminate).

Complete Answer:
Let us analyse the given options to find out the correct answer.
Option A: In cauliflower, the central axis is short and the lower flowers have much extended pedicels than the topper ones. Hence, the flowers happen to be at a similar level. It shapes a compound corymb type of inflorescence. Therefore this is the correct option.

Option B: A corymb is a raceme in which the pedicels of the shorter flowers are extended than those of the United flowers so that the inflorescence has a flat-out appearance all-around, as in hawthorn (Crataegus). This is the incorrect option.

Option C: An umbel is an inflorescence that consists of various low flower stalks which circulate from a widespread point, relatively like umbrella ribs. Therefore this is the incorrect option.

Option D: A catkin or ament is a small, cylindrical blossom clump (a spike), with unobtrusive or no petals, usually wind-pollinated (anemophilous) but occasionally insect-pollinated (as in Salix). They include many, usually unisexual flowers, organized closely along a prominent stem that is frequently drooping. Therefore this is the incorrect option.

Thus, option A is the correct option.

Note: In corymb type of inflorescence peduncle is low with pedicellate blossoms. All the blossoms happen at a similar level. The stalk of the lower flower is extended than younger upper flowers.
When the central axis is spread out in a corymbose way and each limb has flowers organized in corymbs, it is realized as a compound corymb.