Answer:
D. It's best not to take too much luggage.
Step-by-step explanation:
I'll provide an explanation as to why each sentence is incorrect, as well as a corrected version. The given sentences, apart from D, are using uncountable nouns incorrectly. An uncountable word is a noun that is not individual or separate, and is instead viewed as a collective, mass noun. Examples of these include (but aren't limited to):
1. Substances: water, air, sand
2. Abstract Concepts: happiness, knowledge, love
3. Food and Drinks: rice, bread, coffee
4. Materials: wood, plastic, steel
Uncountable nouns don't use articles like "a" or "an" before them, despite appearing as individual nouns.
A. Amish can’t have a long hair.
Correction: Amish can't have long hair.
Explanation: "Hair" is an uncountable noun in this case, so it doesn't need the "a" before it. The hair in this sentence is referring to a whole group of multiple hairs, so, despite appearing singular, we don't write it as such.
B. I’ve just heard a very interesting news.
Correction: I've just heard very interesting news.
Explanation: "News" here is the uncountable noun, so the same concept applies.
C. There’s always a terrible traffic in Los Angeles.
Correction: There’s always terrible traffic in Los Angeles.
Explanation: "Traffic" here is the uncountable noun, so the same concept applies.
Hope this helps, grammar can be tricky!