Please excuse me __________ being late.
A) by
B) from
C) for
D) on

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Hint:First read all the options carefully. We must know about the words and situations where they are used and also we must see that the selected option will make the sentence meaningful.
Choose the option which will be grammatically correct.

Complete step-by-step answer:
 Let’s understand first what a preposition is.
Preposition: A preposition is a word placed before a noun or a pronoun to show in what relation the person or thing denoted by it stands in regard to something else.
The word Preposition means “that which is placed before”.
Example: 1) There is a cow in the field.
2) He is fond of tea.
3) The cat jumped off the chair.
The word in, of, off are used as prepositions and showing the relation between “noun to another noun”, “ noun to an adjective”, “ noun to verb”.
Now let’s examine and understand which option is suitable for the given sentence.
The given options: option [A] by, option [B] from, and option [D] on, are indicating the use of an agent, a place and position respectively. Hence, they are inappropriate options.
Here the correct answer is option [C] for as it is indicating an output or result (being late).
Option C is the correct answer.

Note:The word “for” can function as a Preposition and in some cases it can perform as a Conjunction. Conjunction is the word used to connect sentences, clauses or to connect the sentences which are present in the clauses.