Option (c) is correct
100g conc acid solution contains 98 g or 1 mole H2SO4
So 100/1.8 mL acid solution contains 1 mole acid
x mL solution contains 1.8/100*x mol H2SO4
If this x mLsolution is required to make
1L 0.1 M acid solution then
1.8x/100=0.1
=>x,=100/18=5.55mL