The given Bar Graph presents the number of different types of vehicles exported by a company in 2017 and 2018.

The increase in the exports in 2018 as compared to that in 2017 is closest to 32 % in case of vehicles of type:

Percentage Increase in export of vehicle A from 2017 to 2018 = $$\frac{\left(35-25\right)\times\ 100}{25}$$ = 40%

Percentage Increase in export of vehicle B from 2017 to 2018 = $$\frac{\left(45-30\right)\times\ 100}{30}$$ = 50%

Percentage Increase in export of vehicle C from 2017 to 2018 = $$\frac{\left(50-38\right)\times\ 100}{38}$$ = 31.58% (approx.)

PercentageIncrease in export of vehicle D from 2017 to 2018 = $$\frac{\left(43-32\right)\times\ 100}{32}$$ = 34.37% (approx.)

Percentage Increase in export of vehicle E from 2017 to 2018 = $$\frac{\left(47-40\right)\times\ 100}{40}$$ = 17.5%

After solving each vehicle's export increase from one year to another one, we can say that vehicle C's export is increased by around 32%.