**Core Concept:** Asthma is a chronic respiratory condition characterized by airway inflammation, bronchoconstriction, and airway hyperresponsiveness. The severity of asthma is typically graded based on symptom frequency, nighttime symptoms, and the need for reliever medication.

**Why the Correct Answer is Right:** According to the provided information, the child has experienced wheezing episodes during both daytime and nighttime. This frequency meets the criteria for asthma grading.

**Why Each Wrong Option is Incorrect:**

A. This option does not consider the nighttime symptoms mentioned in the question.
B. Although this option mentions daytime symptoms, it does not include the nighttime symptoms, which are crucial for grading asthma severity.
C. This option only considers daytime symptoms, ignoring the nighttime episodes and their frequency during the month.
D. This option only mentions the need for reliever medication, but the question highlights both daytime and nighttime symptoms, making the correct answer more accurate.

**Clinical Pearl:** A detailed clinical assessment, including symptoms, triggers, and response to therapy, is essential for accurate asthma grading and appropriate treatment planning.

**Correct Answer:** D. The correct answer considers both daytime and nighttime symptoms, meeting the criteria for asthma grading as per the given information.