Select all false statements from the options below:

Select all that apply:

a$.$ The presence of fricatives in a language implies the presence of affricates.

b$.$ Phonemic nasal vowels are unmarked.

c$.$ The most common nasal is $\frac{?}{?}\frac{n}{?}.$

d$.$ The presence of voiced obstruents in a language implies the presence of voiceless obstruents.

e$.$ Languages with complex onsets allow onsets with single consonants

f$.$ Suffixes are more common cross$-$linguistically than prefixes.