Answer: you need to take in that there might be counter arguments you need to have proof or evidence of some sort, and you also need strong visual language.
Explanation:
The preposition 'since' always shows a time relationship from the past to the present.
When you say 'since Monday' it means that he didn't have a car available from Monday until now.So, a time relatioship
Both sentences A and B are capitalized correctly:
Only one solution is possible: We must cut our expenses.
Only one solution is possible: we must cut our expenses.
The first word of both sentences (only) must always be capitalized since it is placed at the beginning.
On the other hand, if the sentence following the colon is dependent (it is incomplete), its first word should not be capitalized. For example:
"I have to buy three things: apples, oranges and bananas."
Regarding capitalization in independent clauses following a colon (such as the one given in the example), it is subject to the citation style the writer is following (APA, MLA, etc). While some styles recommend capitalization of the first word of the sentence, some others do not.
To not let a king rise again