The table shows, for 2014 and 2015, the number of viewers of four television programs and the total number of viewers at the times when the programs were shown - HSC - SSCE Business Studies - Question 20 - 2015 - Paper 1

For Program B in 2014:

$\text{Market Share B 2014} = \frac{600,000}{1,200,000} = 0.5$

For 2015:

$\text{Market Share B 2015} = \frac{800,000}{1,400,000} \approx 0.571$

Thus, Program B's market share increases from 0.5 to approximately 0.571.

For Program C:

$\text{Market Share C 2014} = \frac{300,000}{1,200,000} = 0.25$

For 2015:

$\text{Market Share C 2015} = \frac{350,000}{1,500,000} \approx 0.233$

There is actually a decrease in market share.

For Program D:

$\text{Market Share D 2014} = \frac{400,000}{1,200,000} \approx 0.333$

For 2015:

$\text{Market Share D 2015} = \frac{400,000}{1,400,000} \approx 0.286$

There is a decrease in market share.