Which of the following is an example of indicative verb mood?

a).If his parents let him, he will come outside to play.
b).Open the door for the old lady.
c).I believe you should have a 60's themed party
d).We had spaghetti for dinner.

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actually the right answer is

d).We had spaghetti for dinner.

The indicative verb mood is used to state facts, opinions, or ask questions. It is the most common verb mood in English.

In the given options, the example of indicative verb mood is option d): "We had spaghetti for dinner." This sentence is making a statement about a past event, stating a fact.

To identify the indicative mood in a sentence, you can look for verbs that express a fact or are used in a declarative manner. Indicative mood sentences typically do not express uncertainty or give commands or requests.

http://grammarist.com/grammar/english-moods/

Read about indicative here and let us know what you think.