Step 1: Understand the sentence structure.
The sentence has two contrasting parts joined by the word “but”:
The first part talks about “tech enthusiasts” appreciating the update's innovative features – a positive opinion.
The second part mentions “numerous bugs”, which is a negative trait, causing some users to react negatively.
Step 2: Match tones with the correct words.
We need:
A positive word for the first blank (praise for innovation).
A negative word for the second blank (disapproval due to bugs).
Step 3: Analyze the choices:
(A) appreciated & Positive – suitable for the first blank.
(B) welcomed & Positive – suitable for the first blank.
(C) detested & Strong negative – too extreme for second blank.
(D) celebrated & Positive – suitable for the first blank.
(E) criticized & Negative – fits the second blank well.
(F) praised & Positive – suitable for the first blank.
\end{tabular}
Step 4: Find the best-fitting pair.
The phrase:
\[
\text{"The update was _________ by tech enthusiasts..."}
\]
suggests a moderate, professional approval – “welcomed” fits best among the option.
The phrase:
\[
\text{"...but some users found it _________ due to bugs"}
\]
indicates disapproval – “criticized” is a precise, appropriate term.