Select the most appropriate word to complete the following sentence:-

The teacher encouraged the students to _____ when they didn't understand the topic.

speak up

The correct answer is Option (3) → speak up

Speak up (Phrasal verb) means to express one's opinion or feelings frankly, or to talk more loudly. In this context, it means to ask questions or state their confusion rather than remaining silent. This is the logical action encouraged by a teacher when students are confused.

Other Options: 

• Hold back: To restrain oneself or refrain from acting or speaking. (Opposite of what the teacher wants).

• Move on: To proceed to the next thing. (Would leave the topic unexplained).

• Step aside: To temporarily leave a position or move out of the way. (Irrelevant to the context).