What is the smallest positive fraction that must be added to the fraction $$\frac{3}{5} \times \frac{16}{21} \times \frac{7}{10} \times \frac{3}{4}$$​ to make it a whole number?

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Correct option is B

​Given:
Expression:

​$$\frac{3}{5} \times \frac{16}{21} \times \frac{7}{10} \times \frac{3}{4}$$​​

​Solution:

​$$\text{Product} = \frac{3 \times 16 \times 7 \times 3}{5 \times 21 \times 10 \times 4} = \frac{1008}{4200} = \frac{24}{100}$$​​

Smallest fraction to make it whole:

= $$1 - \frac{24}{100} = \frac{76}{100} = \frac{19}{25}$$​​