When pedicellate , bisexual flowers are born acropetally, it is
Corymb
Catkin
Raceme
Spike
Option 3 is the correct answer. The raceme is a peduncle having bisexual and pedicellate flowers organized acropetally. It is a kind of racemose inflorescence. Examples are Larkspur and radish.
Explanation for the incorrect options :
Option 1: A corymb is lower flowers that have long pedicels than spikes and axes are brief. It is a sort of racemose inflorescence. Examples are Iberis and Capsella.
Option 2: Catkin is the pendulous spike in the leaf axis that bears unisexual flowers. It is a sort of racemose inflorescence. Examples are Morus, birch, and oak.
Option 4: Spike is a peduncle consisting of bisexual and sessile flowers and a kind of racemose inflorescence. Examples are Achyranthes and Adhathoda.