My teacher informed me that B& C where not rounded correctly please help

Practice Examples 1. Determine the number of significant figures in each of the following values. (Example: a) 0.00021 has 2 significant figures, therefore the answer is: 2.) (1 pt each for 6 pts total) a) 0.00021 2 significant figures b) 0.23500 2. significant figures c) 2.8970 x 103 4. significant figures d) 1.289003 x 1074 5. significant figures e) 0.02900450 7. significant figures