Public opinion  is difficult to measure because it can be

Analyze the question The question asks why public opinion is difficult to measure. We need the option that describes something that makes the results unreliable or inaccurate.

Explain the concept Public opinion is the collective views of people in a society on political issues, government policies, or public affairs. It is measured through opinion polls, surveys, referendums, elections, and media content analysis. Accurate measurement depends on people's views being genuine and the data being free from distortion.

Evaluate the options

• A. Transferred: Opinion is not "transferred" in any way that affects measurement. This does not fit.
• B. Communicated: Communication is how opinion becomes known. It helps measurement rather than making it difficult.
• C. Manipulated: Public opinion can be shaped, distorted or influenced by the government, politicians, the media, propaganda, pressure groups and even by how poll questions are worded. When opinion is manipulated, what people say may not reflect what they truly think, so measuring it accurately becomes hard. This fits.
• D. Expressed: Expression is the means by which opinion is revealed. It is not a cause of difficulty in itself.

Answer The correct option is C. manipulated.

Tip: In Government questions about why something is "difficult to measure" or "unreliable", look for words like manipulated, distorted, biased or influenced. Neutral words like "communicated" or "expressed" are usually distractors.