VOCABULARY — Choose the best synonym (same meaning) of the highlighted word, based on the sentence. Sentence: “As soon as he finished his speech, there was SPONTANEOUS applause from the audience.”

Introduction / Context:
In event and audience contexts, “spontaneous” describes actions that arise naturally without planning or prompting. Applause that breaks out on its own is spontaneous because it is unpremeditated. This question asks for the closest synonym retaining that nuance.

Given Data / Assumptions:

• The action is applause, occurring after a speech.
• Spontaneous here emphasizes unplanned origin, not merely speed.
• We need a synonym focusing on natural, unforced reaction.

Concept / Approach:
“Instinctive” means prompted by natural impulse, not deliberate thought—matching “spontaneous” as unpremeditated. “Instantaneous” stresses immediacy (very fast), which is not the key idea. “Well-timed” refers to appropriateness of timing, often planned. “Willing” describes readiness or consent, not the unplanned character of the applause.

Step-by-Step Solution:
1) Extract core sense: unplanned, arising naturally.2) Compare: “instinctive” mirrors that sense; “instantaneous” changes the focus to speed.3) Substitute: “there was instinctive applause” keeps the natural-reaction nuance.4) Reject planning- or timing-based distractors.

Verification / Alternative check:
Similar contexts use “spontaneous outburst,” “instinctive response”—both describe reactions without forethought, supporting synonymy.

Why Other Options Are Wrong:
A) “well-timed” — implies judgment and planning.B) “willing” — relates to consent, not spontaneity.D) “instantaneous” — speed, not origin.

Common Pitfalls:
Assuming “spontaneous” equals “instantaneous.” Something can be quick yet planned; spontaneity is about lack of premeditation.

Final Answer:
instinctive