The inflorescence in which the flowers develop from different places of the peduncle and reach the same level is -
(a)Catkin
(b)Corymb
(c)Umbel
(d)Raceme

Hint: The arrangement in the question is an example of the racemose inflorescence. The peduncle is the stem that holds the entire inflorescence. The particular inflorescence has a flat-topped or convex shape as their upper flowers are short and lower flowers are longer, thus reaching the same level.

Complete answer:
- The corymb is a simple racemose (indeterminate) inflorescence that has a flat-topped or convex shape. The pedicels of the upper flowers are short and that of the lower flowers are longer, which makes the flowers appear at the same level.
- The unbranched peduncle bears flowers in an acropetal manner.
- Examples of this inflorescence are Candytuft and Capsella.

Additional information:
- The catkin is a simple racemose inflorescence that is a single, compact, unisexual, and drooping spike.
- The umbel is a simple racemose inflorescence that consists of a reduced peduncle where the flowers appear as if they arise from the same point. A whorl or rosette of bracts known as the involucre is present at the base of the flowers.
- Raceme is an unbranched simple inflorescence. The peduncle consists of bisexual and pedicellate flowers arranged acropetally.
- Other types of the inflorescence are solitary flowers, cymose inflorescence, mixed inflorescence, and special inflorescence.


So, the correct answer is ‘Corymb’.

Note:
- The umbel arrangement is characteristic of the Umbelliferae family that consists of parsley, carrot, and celery.
- The corymb has a superficial resemblance to the umbel inflorescence and the branching appears to be similar to a panicle.