In which month does the Grand National take place?

The Grand National is one of the most prestigious horse races in the UK, and it is traditionally held in April. Specifically, the race usually takes place on the first Saturday of April at Aintree Racecourse near Liverpool. This month has become synonymous with the event due to its long-standing history; the first Grand National was held in 1839, and it has since developed into a significant cultural highlight on the British sporting calendar.

Given this context, the other months mentioned do not align with the established schedule of the Grand National, as it has never been held in May, March, or June. Therefore, April is the only correct choice for when this iconic race occurs.