What happens when an advertiser sets a daily budget lower than the recommended amount, using the "Standard" delivery method?

What happens when an advertiser sets a daily budget lower than the recommended amount, using the "Standard" delivery method?

A)  Ads will show when a user searches on the advertisers keywords, but the ads rank will be reduced.
B)  Ads will show each time a user searches on the advertisers keywords, but only during specified time periods
C)  Ads will not show every time a user searches on the advertisers keywords
D)  Ads will never show when a user searches on the advertisers keywords

Answer : Ads will not show every time a user searches on the advertisers keywords

Reason :

Standard delivery-

How it works: The standard delivery method aims to evenly distribute your budget across the entire day (12 a.m. – 11:59 p.m.) to avoid exhausting your budget early on.

Why use it: Recommended for new advertisers, this delivery method is useful if you want to reach customers evenly throughout the day. If you have a small budget, this method can also help you avoid spending your entire budget in the morning. For instance, if you run a gourmet food delivery business, you'd want to make sure you reach customers at breakfast, lunch, and dinner.

What to expect: Since your ad delivery occurs throughout the day, you might not see your ad appear every time you look for it, particularly if your campaign is limited by budget.

Read more at https://support.google.com/adwords/answer/2404248?hl=en