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1. I have a question about the difference between "too much burden" and "too much of a burden."

What is the difference in meaning?

If it should have the same meaning, why are they used in both ways?

2. When I am late for school, a meeting, or etc., which should I use,

a) I am sorry for being late

b) I am sorry about being late

c) I am sorry to be late

d) I am sorry that I am late

and.. what is the meaning (or grammar) difference?

Thank you for your answer in advance.

Have a fantabulous evening.
Comments 
Anonymous1. I have a question about the difference between "too much burden" and "too much of a burden."
What is the difference in meaning?
If it should have the same meaning, why are they used in both ways?
I'm not aware that they are both used. The only one that I can imagine in a sentence is 'too much of a burden'.

Anonymous2. When I am late for school, a meeting, or etc., which should I use,
a) I am sorry for being late
b) I am sorry about being late
c) I am sorry to be late
d) I am sorry that I am late
and.. what is the meaning (or grammar) difference?
Any of them will do. Native speakers usually say the shorter version "Sorry I'm late".

CJ