From the given options choose the one which is the closest in meaning to the word given below 

REGULAR

Frequent

The word that is closest in meaning to the word regular is frequent.

• Regular means happening or appearing at fixed intervals.
• Frequent means happening or appearing often.

Both words refer to the idea of something happening often, but regular implies a more specific pattern or schedule, while frequent can be used to describe anything that happens often, regardless of any pattern or schedule.

The other words in the options do not have the same meaning as regular.

• Big means of a large size or extent.
• Large means of considerable size or extent.
• Systematic means done or arranged according to a plan or system.