**Explanation:**

To find the missing letter, we need to look for a letter that completes the word "PLE _ SE".

Let's analyze the given options:

a) C
b) A
c) D
d) J

Let's consider each option and see if it fits the pattern:

a) C: If we insert "C" in the missing space, the word becomes "PLECSE". This does not form a recognizable word.

b) A: If we insert "A" in the missing space, the word becomes "PLEASE", which is a recognizable word and makes sense in the given context. Therefore, option B is a possible answer.

c) D: If we insert "D" in the missing space, the word becomes "PLEDSE". This does not form a recognizable word.

d) J: If we insert "J" in the missing space, the word becomes "PLEJSE". This does not form a recognizable word.

Based on the analysis above, the correct answer is option B) A.

Note: It is important to carefully consider the given options and think logically to find the missing letter. In this case, the correct answer is the letter that completes the word and forms a recognizable word in the given context.