improve machinery so that the substances released from combustion are less harmful
pass strict laws against it by individuals and companies
educate people on the causes and effects of pollution
convert chemical wastes to harmless substances before releasing them into the environment
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The most effective amongst all is to educate the people on the causes and effect of pollution, because when the people understands this, they wouldn't want to polute the environment anymore.
option C is wrong myschool, think about it,machine that still uses fuel are still the same thing we are using till date. so tell me how will you educate people on the effect of pollution if the major thing that causes the pollution is still in use, i strongly suggest that even when people are being educated about the effects of pollution,they need to be taught how to convert the pollutant into hatmless substance before they are being dispose into the environment. so a choose option A
Guys the reason why tha answer is C is because A,B and D are all ways to control Air pollution while C is not even a way of controlling Air pollution so its like the odd one out of the right answers.
referencw; New school chemistry, Page 298! Control of air pollution. 
I think they're all ways of controlling air pollution but the question says major and effective way. Personally I thought the ans would be D but 3 out of 4 past questions I checked picked C as the ans so.. who am i🤷.
Plus Ababio listed A-C as methods of controlling air pollution.
What i don't understand here is what about companies and industries polluting the environment, am very sure they know about its disadvantages
The answer is D,
Chemical waste should be converted to harmless substance before releasing them to the atmosphere, it can't be B because the said "by individual/ government" it can't be be because some people may not listen at all, so its D
