B questions generally need two explained points of the same opinion
C question need four explained points showing signs of knowledge ( Opinions not neccessary)
D questions usually need two different opinions, one supporting your idea, the other with "why someone may disagree with you" Try to include a total of 3 explained points.
Examples:
B - I believe ...... because ...... Also, I believe ...... as .....
C - (Depending on the question) - One reason for this may be as ........ (add one piece of evidence) ........ Also, ....... (explain reason for answer) ....... Another reason could be ...... (elaborate)...... Lastly, ....... (explain)
D - I believe ....... because ....... (explain in detail)
- however someone may disagree because ..... explain ..... and......