One advantage of AM over FM radio signals is that the former mode of transmission is muxh less susceptible to (interference as compared with the latter mode)
Please provide the correct answer
The expression is “less A than B”, not “less A as compared to B”–it’s an idiom/parallel structure question.
It’s also a redundancy question. Words like “more,” “less” and all the adjectives ending in “-er” and “-est” already indicate a comparison. The relationship does not need to be communicated twice.