Explanation:

Integrated Circuits (ICs), commonly known as computer chips, are primarily fabricated from semiconductor materials. Among the available options, Silicon ($ \text{b} $) is the most widely used and fundamental semiconductor material for manufacturing IC chips due to its excellent electrical properties and abundance. It allows for the precise control of electrical conductivity required for transistors and other components on a chip. Options (a) Chromium, (c) Platinum, and (d) Gold are metals that can be used in chip manufacturing for interconnects or contacts due to their conductivity, but they are not the primary semiconductor material from which the transistors and diodes are formed. Therefore, Silicon is the essential material.