Answer:
b. E-mail facilitates collaboration between people in remote locations; however, when collaboration requires the exchange of large data files, it is often easier to use web-based collaboration software.
d. E-mail can be an efficient way to communicate, and it makes communicating across time zones much easier.
Explanation
Sentence B is correct because it employs the use of a semicolon to separate two independent clauses. The use of the conjunction, <em>however</em>, helps to separate two sentences that have opposite connotations.
Sentence D is correct because the conjunction, and, was used appropriately to add a second thought to the sentence. The comma was also used correctly as it spliced the sentence and was immediately followed by the conjunction, <em>and</em>.
Answer:
Number of car washed is 92
So option (a) is correct answer
Explanation:
It is given that 4 workers can wash 80 cars per day
Means initially 80 cars are washed per day
And it is given that rate of car wash is $5 per car
Now price of workers is $60 per day
As per car wash is $5
So number of extra car washed 
So total number of car washed = 80 + 12 = 92 cars per day
So option (a) is correct answer
