Which of these options is a complex sentence?

Choose 1

(Choice A)
A
London’s underground subway system is very efficient and easy to use; the city is large and bustling but well-connected.

(Choice B)
B
London’s underground subway system is very efficient and easy to use, even though the city is large and bustling.

What does the word precocious mean in this sentence

When should you use encyclopedias such as wikipedia? a. never, it is not appropriate to use this source in college b. it can you get an overall understanding of the subject matter but is not considered a college-level source c. as long as wikipedia isn't the only source, it is always appropriate to use this source

Lauses unnecessary to the meanings of the words modified demonstrative 2. clauses necessary to the meanings of the words modified relative 3. words for which pronouns stand intensive 4. a pronoun ending in -self and referring to the previously used noun or pronoun nonrestrictive clauses 5. a pronoun ending in -self and used for emphasis restrictive clauses 6. pronouns that ask questions indefinite pronouns 7. pronouns that point out to whom or to what the speaker is referring reflexive 8. everyone, nobody, and something are examples antecedents 9. pronouns introducing adjective or noun clauses interrogative 10. i, you, him, mine, and their are examples personal pronouns