[Grammar] type of/sort of/kind of + plural

[vcolts]

(A). These kinds of car are suited for racing.

(B). These kinds of cars are suited for racing.

=================
From the BBC site:

Sort of / kind of / type of are usually followed by an uncountable noun
or a singular countable noun with no article, but a / an is sometimes
retained in an informal style.

The BBC site also gives an example like (B), so I am assuming that (B) is the academically acceptable choice.
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Q1. Is (A) grammatically wrong or academically (formally) unacceptable? Or Are both acceptable?

Q2. If (B) is the only acceptable (academically) answer, I would like to ask why we must care for making the noun plural when article a/an (for singular nouns) can be omitted. Ex. "This type of car," as opposed to "this type of a car"


Thanks in advance!

 

[bhaisahab]

(A). These kinds of car are suited for racing.

(B). These kinds of cars are suited for racing.

=================
From the BBC site:

Sort of / kind of / type of are usually followed by an uncountable noun
or a singular countable noun with no article, but a / an is sometimes
retained in an informal style.

The BBC site also gives an example like (B), so I am assuming that (B) is the academically acceptable choice.
=======================

Q1. Is (A) grammatically wrong or academically (formally) unacceptable? Or Are both acceptable?

Q2. If (B) is the only acceptable (academically) answer, I would like to ask why we must care for making the noun plural when article a/an (for singular nouns) can be omitted. Ex. "This type of car," as opposed to "this type of a car"


Thanks in advance!

Neither one is very natural. (B) would be OK as "These types of cars are suitable for racing" if, for example, we are referring a number of different types of cars which are all suitable.

 

[vcolts]

I could make my question clearer.
I wanted to focus on the construction of "types of + plural noun" vs "types of +singular noun."

So to go back to the original question:

"What types of cars (plural noun)" vs. "What types of car (singular noun)"

I found the following thread:
https://www.usingenglish.com/forum/ask-teacher/163563-kind-sort-type-noun.html

So both types are grammtically correct, but only the singular version is academically acceptable, right?

Thanks in advance.