b 

(Translate the following detached sentences into Bangla)

The notable success in the telecom sector of Bangladesh has been driven by three major factors: 1. Availability of capital and smart strategy, primarily through foreign direct investment; 2. Rapid growth to technology options; and 3. Growing purchasing power of consumers, primarily due to remittance income and labour-intensive export-earning of the ready-made garment industry. Instead of demand-driven major cellular operators pursued the supply-driven growth strategy. Having access to low cost foreign fund, these operators speedily expanded the network covering the whole country within a very short span of time to benefit from scale advantages.